diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 719413d2..5a9c105f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -210,7 +210,6 @@ set(INTERFACE_HEADERS
   ${SOURCES_DIR}/interfaces/catch_interfaces_all.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_capture.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_config.hpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_enum_values_registry.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_exception.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_generatortracker.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_registry_hub.hpp
diff --git a/src/catch2/catch_registry_hub.cpp b/src/catch2/catch_registry_hub.cpp
index 0e43db92..17390bc0 100644
--- a/src/catch2/catch_registry_hub.cpp
+++ b/src/catch2/catch_registry_hub.cpp
@@ -71,7 +71,7 @@ namespace Catch {
                 CATCH_INTERNAL_ERROR("Attempted to register active exception under CATCH_CONFIG_DISABLE_EXCEPTIONS!");
 #endif
             }
-            IMutableEnumValuesRegistry& getMutableEnumValuesRegistry() override {
+            EnumValuesRegistry& getMutableEnumValuesRegistry() override {
                 return m_enumValuesRegistry;
             }
 
@@ -81,7 +81,7 @@ namespace Catch {
             ExceptionTranslatorRegistry m_exceptionTranslatorRegistry;
             TagAliasRegistry m_tagAliasRegistry;
             StartupExceptionRegistry m_exceptionRegistry;
-            Detail::EnumValuesRegistry m_enumValuesRegistry;
+            EnumValuesRegistry m_enumValuesRegistry;
         };
     }
 
diff --git a/src/catch2/catch_tostring.hpp b/src/catch2/catch_tostring.hpp
index 904caa7e..c95be44c 100644
--- a/src/catch2/catch_tostring.hpp
+++ b/src/catch2/catch_tostring.hpp
@@ -16,9 +16,9 @@
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_config_wchar.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_void_type.hpp>
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
 
 #ifdef CATCH_CONFIG_CPP17_STRING_VIEW
 #include <string_view>
diff --git a/src/catch2/interfaces/catch_interfaces_all.hpp b/src/catch2/interfaces/catch_interfaces_all.hpp
index 7a0d0c29..df9e53e6 100644
--- a/src/catch2/interfaces/catch_interfaces_all.hpp
+++ b/src/catch2/interfaces/catch_interfaces_all.hpp
@@ -24,7 +24,6 @@
 
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/interfaces/catch_interfaces_config.hpp>
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
 #include <catch2/interfaces/catch_interfaces_exception.hpp>
 #include <catch2/interfaces/catch_interfaces_generatortracker.hpp>
 #include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
diff --git a/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp b/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
deleted file mode 100644
index 38b052d9..00000000
--- a/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
+++ /dev/null
@@ -1,47 +0,0 @@
-
-//              Copyright Catch2 Authors
-// Distributed under the Boost Software License, Version 1.0.
-//   (See accompanying file LICENSE.txt or copy at
-//        https://www.boost.org/LICENSE_1_0.txt)
-
-// SPDX-License-Identifier: BSL-1.0
-#ifndef CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED
-#define CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED
-
-#include <catch2/internal/catch_stringref.hpp>
-
-#include <vector>
-
-namespace Catch {
-
-    namespace Detail {
-        struct EnumInfo {
-            StringRef m_name;
-            std::vector<std::pair<int, StringRef>> m_values;
-
-            ~EnumInfo();
-
-            StringRef lookup( int value ) const;
-        };
-    } // namespace Detail
-
-    class IMutableEnumValuesRegistry {
-    public:
-        virtual ~IMutableEnumValuesRegistry(); // = default;
-
-        virtual Detail::EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::vector<int> const& values ) = 0;
-
-        template<typename E>
-        Detail::EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::initializer_list<E> values ) {
-            static_assert(sizeof(int) >= sizeof(E), "Cannot serialize enum to int");
-            std::vector<int> intValues;
-            intValues.reserve( values.size() );
-            for( auto enumValue : values )
-                intValues.push_back( static_cast<int>( enumValue ) );
-            return registerEnum( enumName, allEnums, intValues );
-        }
-    };
-
-} // Catch
-
-#endif // CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED
diff --git a/src/catch2/interfaces/catch_interfaces_registry_hub.hpp b/src/catch2/interfaces/catch_interfaces_registry_hub.hpp
index 113f223e..ebd5192d 100644
--- a/src/catch2/interfaces/catch_interfaces_registry_hub.hpp
+++ b/src/catch2/interfaces/catch_interfaces_registry_hub.hpp
@@ -23,7 +23,7 @@ namespace Catch {
     class IReporterFactory;
     class ITagAliasRegistry;
     class ITestInvoker;
-    class IMutableEnumValuesRegistry;
+    class EnumValuesRegistry;
     struct SourceLineInfo;
 
     class StartupExceptionRegistry;
@@ -53,7 +53,7 @@ namespace Catch {
         virtual void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator ) = 0;
         virtual void registerTagAlias( std::string const& alias, std::string const& tag, SourceLineInfo const& lineInfo ) = 0;
         virtual void registerStartupException() noexcept = 0;
-        virtual IMutableEnumValuesRegistry& getMutableEnumValuesRegistry() = 0;
+        virtual EnumValuesRegistry& getMutableEnumValuesRegistry() = 0;
     };
 
     IRegistryHub const& getRegistryHub();
diff --git a/src/catch2/internal/catch_enum_values_registry.cpp b/src/catch2/internal/catch_enum_values_registry.cpp
index 7e8bf5e5..5a9e7c53 100644
--- a/src/catch2/internal/catch_enum_values_registry.cpp
+++ b/src/catch2/internal/catch_enum_values_registry.cpp
@@ -12,44 +12,47 @@
 
 namespace Catch {
 
-    IMutableEnumValuesRegistry::~IMutableEnumValuesRegistry() = default;
-
     namespace Detail {
 
         namespace {
             // Extracts the actual name part of an enum instance
-            // In other words, it returns the Blue part of Bikeshed::Colour::Blue
-            StringRef extractInstanceName(StringRef enumInstance) {
+            // In other words, it returns the Blue part of
+            // Bikeshed::Colour::Blue
+            static StringRef extractInstanceName( StringRef enumInstance ) {
                 // Find last occurrence of ":"
                 size_t name_start = enumInstance.size();
-                while (name_start > 0 && enumInstance[name_start - 1] != ':') {
+                while ( name_start > 0 &&
+                        enumInstance[name_start - 1] != ':' ) {
                     --name_start;
                 }
-                return enumInstance.substr(name_start, enumInstance.size() - name_start);
+                return enumInstance.substr( name_start,
+                                            enumInstance.size() - name_start );
             }
-        }
+        } // end unnamed namespace
 
         std::vector<StringRef> parseEnums( StringRef enums ) {
             auto enumValues = splitStringRef( enums, ',' );
             std::vector<StringRef> parsed;
             parsed.reserve( enumValues.size() );
-            for( auto const& enumValue : enumValues ) {
-                parsed.push_back(trim(extractInstanceName(enumValue)));
+            for ( auto const& enumValue : enumValues ) {
+                parsed.push_back( trim( extractInstanceName( enumValue ) ) );
             }
             return parsed;
         }
 
-        EnumInfo::~EnumInfo() {}
+        EnumInfo::~EnumInfo() = default;
 
         StringRef EnumInfo::lookup( int value ) const {
-            for( auto const& valueToName : m_values ) {
-                if( valueToName.first == value )
-                    return valueToName.second;
+            for ( auto const& valueToName : m_values ) {
+                if ( valueToName.first == value ) { return valueToName.second; }
             }
             return "{** unexpected enum value **}"_sr;
         }
 
-        Catch::Detail::unique_ptr<EnumInfo> makeEnumInfo( StringRef enumName, StringRef allValueNames, std::vector<int> const& values ) {
+        Catch::Detail::unique_ptr<EnumInfo>
+        makeEnumInfo( StringRef enumName,
+                      StringRef allValueNames,
+                      std::vector<int> const& values ) {
             auto enumInfo = Catch::Detail::make_unique<EnumInfo>();
             enumInfo->m_name = enumName;
             enumInfo->m_values.reserve( values.size() );
@@ -57,17 +60,22 @@ namespace Catch {
             const auto valueNames = Catch::Detail::parseEnums( allValueNames );
             assert( valueNames.size() == values.size() );
             std::size_t i = 0;
-            for( auto value : values )
-                enumInfo->m_values.emplace_back(value, valueNames[i++]);
+            for ( auto value : values ) {
+                enumInfo->m_values.emplace_back( value, valueNames[i++] );
+            }
 
             return enumInfo;
         }
 
-        EnumInfo const& EnumValuesRegistry::registerEnum( StringRef enumName, StringRef allValueNames, std::vector<int> const& values ) {
-            m_enumInfos.push_back(makeEnumInfo(enumName, allValueNames, values));
-            return *m_enumInfos.back();
-        }
+    } // namespace Detail
 
-    } // Detail
-} // Catch
+    Detail::EnumInfo const&
+    EnumValuesRegistry::registerEnum( StringRef enumName,
+                                      StringRef allValueNames,
+                                      std::vector<int> const& values ) {
+        m_enumInfos.push_back(
+            Detail::makeEnumInfo( enumName, allValueNames, values ) );
+        return *m_enumInfos.back();
+    }
 
+} // namespace Catch
diff --git a/src/catch2/internal/catch_enum_values_registry.hpp b/src/catch2/internal/catch_enum_values_registry.hpp
index 999059ae..64776355 100644
--- a/src/catch2/internal/catch_enum_values_registry.hpp
+++ b/src/catch2/internal/catch_enum_values_registry.hpp
@@ -8,29 +8,54 @@
 #ifndef CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED
 #define CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
-#include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_stringref.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <vector>
 
 namespace Catch {
 
     namespace Detail {
+        struct EnumInfo {
+            StringRef m_name;
+            std::vector<std::pair<int, StringRef>> m_values;
 
-        Catch::Detail::unique_ptr<EnumInfo> makeEnumInfo( StringRef enumName, StringRef allValueNames, std::vector<int> const& values );
+            ~EnumInfo();
 
-        class EnumValuesRegistry : public IMutableEnumValuesRegistry {
-
-            std::vector<Catch::Detail::unique_ptr<EnumInfo>> m_enumInfos;
-
-            EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::vector<int> const& values) override;
+            StringRef lookup( int value ) const;
         };
 
+        Detail::unique_ptr<EnumInfo>
+        makeEnumInfo( StringRef enumName,
+                      StringRef allValueNames,
+                      std::vector<int> const& values );
         std::vector<StringRef> parseEnums( StringRef enums );
 
-    } // Detail
+    } // namespace Detail
 
-} // Catch
+    class EnumValuesRegistry {
+        std::vector<Catch::Detail::unique_ptr<Detail::EnumInfo>> m_enumInfos;
+
+    public:
+        Detail::EnumInfo const& registerEnum( StringRef enumName,
+                                              StringRef allEnums,
+                                              std::vector<int> const& values );
+        template <typename E>
+        Detail::EnumInfo const&
+        registerEnum( StringRef enumName,
+                      StringRef allEnums,
+                      std::initializer_list<E> values ) {
+            static_assert( sizeof( int ) >= sizeof( E ),
+                           "Cannot serialize enum to int" );
+            std::vector<int> intValues;
+            intValues.reserve( values.size() );
+            for ( auto enumValue : values ) {
+                intValues.push_back( static_cast<int>( enumValue ) );
+            }
+            return registerEnum( enumName, allEnums, intValues );
+        }
+    };
+
+} // namespace Catch
 
 #endif // CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED
diff --git a/src/catch2/meson.build b/src/catch2/meson.build
index fee3b4ed..879c6244 100644
--- a/src/catch2/meson.build
+++ b/src/catch2/meson.build
@@ -58,7 +58,6 @@ internal_headers = [
   'interfaces/catch_interfaces_all.hpp',
   'interfaces/catch_interfaces_capture.hpp',
   'interfaces/catch_interfaces_config.hpp',
-  'interfaces/catch_interfaces_enum_values_registry.hpp',
   'interfaces/catch_interfaces_exception.hpp',
   'interfaces/catch_interfaces_generatortracker.hpp',
   'interfaces/catch_interfaces_registry_hub.hpp',