diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 662e7a2a..9c92cb89 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -104,8 +104,8 @@ set(INTERNAL_HEADERS
     ${SOURCES_DIR}/internal/catch_singletons.hpp
     ${SOURCES_DIR}/internal/catch_startup_exception_registry.hpp
     ${SOURCES_DIR}/internal/catch_stream.hpp
-    ${SOURCES_DIR}/catch_stringref.hpp
     ${SOURCES_DIR}/internal/catch_string_manip.hpp
+    ${SOURCES_DIR}/internal/catch_stringref.hpp
     ${SOURCES_DIR}/catch_tag_alias.hpp
     ${SOURCES_DIR}/catch_tag_alias_autoregistrar.hpp
     ${SOURCES_DIR}/internal/catch_tag_alias_registry.hpp
diff --git a/src/catch2/catch_all.hpp b/src/catch2/catch_all.hpp
index 0cc9550d..c3f35500 100644
--- a/src/catch2/catch_all.hpp
+++ b/src/catch2/catch_all.hpp
@@ -24,7 +24,6 @@
 #include <catch2/catch_reporter_registrars.hpp>
 #include <catch2/catch_section_info.hpp>
 #include <catch2/catch_session.hpp>
-#include <catch2/catch_stringref.hpp>
 #include <catch2/catch_tag_alias.hpp>
 #include <catch2/catch_tag_alias_autoregistrar.hpp>
 #include <catch2/catch_template_test_macros.hpp>
@@ -72,6 +71,7 @@
 #include <catch2/internal/catch_startup_exception_registry.hpp>
 #include <catch2/internal/catch_stream.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_tag_alias_registry.hpp>
 #include <catch2/internal/catch_template_test_registry.hpp>
 #include <catch2/internal/catch_test_case_registry_impl.hpp>
diff --git a/src/catch2/catch_assertion_info.hpp b/src/catch2/catch_assertion_info.hpp
index b05f4921..1e94f21f 100644
--- a/src/catch2/catch_assertion_info.hpp
+++ b/src/catch2/catch_assertion_info.hpp
@@ -10,7 +10,7 @@
 
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_common.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 namespace Catch {
 
diff --git a/src/catch2/catch_assertion_result.hpp b/src/catch2/catch_assertion_result.hpp
index 5b1029f3..1afcf7c9 100644
--- a/src/catch2/catch_assertion_result.hpp
+++ b/src/catch2/catch_assertion_result.hpp
@@ -12,7 +12,7 @@
 #include <catch2/catch_assertion_info.hpp>
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_common.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_assertionhandler.hpp>
 
 namespace Catch {
diff --git a/src/catch2/catch_config.cpp b/src/catch2/catch_config.cpp
index 263fb232..1f89af56 100644
--- a/src/catch2/catch_config.cpp
+++ b/src/catch2/catch_config.cpp
@@ -8,7 +8,7 @@
 #include <catch2/catch_config.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_stream.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/internal/catch_test_spec_parser.hpp>
 
diff --git a/src/catch2/catch_section_info.hpp b/src/catch2/catch_section_info.hpp
index 6c8edb53..69648d0c 100644
--- a/src/catch2/catch_section_info.hpp
+++ b/src/catch2/catch_section_info.hpp
@@ -9,7 +9,7 @@
 #define TWOBLUECUBES_CATCH_SECTION_INFO_H_INCLUDED
 
 #include <catch2/internal/catch_common.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/catch_totals.hpp>
 
 #include <string>
diff --git a/src/catch2/catch_test_case_info.hpp b/src/catch2/catch_test_case_info.hpp
index ccdaec67..f586ce92 100644
--- a/src/catch2/catch_test_case_info.hpp
+++ b/src/catch2/catch_test_case_info.hpp
@@ -9,7 +9,7 @@
 #define TWOBLUECUBES_CATCH_TEST_CASE_INFO_H_INCLUDED
 
 #include <catch2/internal/catch_common.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_test_registry.hpp>
 
 #include <string>
diff --git a/src/catch2/interfaces/catch_interfaces_capture.hpp b/src/catch2/interfaces/catch_interfaces_capture.hpp
index 72fdcbec..d26d4f27 100644
--- a/src/catch2/interfaces/catch_interfaces_capture.hpp
+++ b/src/catch2/interfaces/catch_interfaces_capture.hpp
@@ -11,7 +11,7 @@
 #include <string>
 #include <chrono>
 
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_result_type.hpp>
 
 namespace Catch {
diff --git a/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp b/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
index 2439c630..1a4fce26 100644
--- a/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
+++ b/src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
@@ -8,7 +8,7 @@
 #ifndef TWOBLUECUBES_CATCH_INTERFACESENUMVALUESREGISTRY_H_INCLUDED
 #define TWOBLUECUBES_CATCH_INTERFACESENUMVALUESREGISTRY_H_INCLUDED
 
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <vector>
 
diff --git a/src/catch2/interfaces/catch_interfaces_reporter.hpp b/src/catch2/interfaces/catch_interfaces_reporter.hpp
index 9edb9951..4c7391ec 100644
--- a/src/catch2/interfaces/catch_interfaces_reporter.hpp
+++ b/src/catch2/interfaces/catch_interfaces_reporter.hpp
@@ -16,7 +16,7 @@
 #include <catch2/catch_assertion_result.hpp>
 #include <catch2/catch_message.hpp>
 #include <catch2/internal/catch_option.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
diff --git a/src/catch2/internal/catch_decomposer.hpp b/src/catch2/internal/catch_decomposer.hpp
index 6ed828b9..4c90091c 100644
--- a/src/catch2/internal/catch_decomposer.hpp
+++ b/src/catch2/internal/catch_decomposer.hpp
@@ -9,7 +9,7 @@
 #define TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
 
 #include <catch2/catch_tostring.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_meta.hpp>
 
 #include <iosfwd>
diff --git a/src/catch2/internal/catch_list.hpp b/src/catch2/internal/catch_list.hpp
index 14abea77..88e4c2c8 100644
--- a/src/catch2/internal/catch_list.hpp
+++ b/src/catch2/internal/catch_list.hpp
@@ -9,7 +9,7 @@
 #define TWOBLUECUBES_CATCH_LIST_H_INCLUDED
 
 #include <catch2/catch_config.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <set>
 #include <string>
diff --git a/src/catch2/internal/catch_stream.cpp b/src/catch2/internal/catch_stream.cpp
index 5a29441b..809acc0b 100644
--- a/src/catch2/internal/catch_stream.cpp
+++ b/src/catch2/internal/catch_stream.cpp
@@ -11,7 +11,7 @@
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_stream.hpp>
 #include <catch2/internal/catch_debug_console.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_singletons.hpp>
 
 #include <cstdio>
diff --git a/src/catch2/internal/catch_string_manip.cpp b/src/catch2/internal/catch_string_manip.cpp
index 4e9322da..b24ec880 100644
--- a/src/catch2/internal/catch_string_manip.cpp
+++ b/src/catch2/internal/catch_string_manip.cpp
@@ -6,7 +6,7 @@
  */
 
 #include <catch2/internal/catch_string_manip.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <algorithm>
 #include <ostream>
diff --git a/src/catch2/internal/catch_string_manip.hpp b/src/catch2/internal/catch_string_manip.hpp
index f0b36a69..8570a8c0 100644
--- a/src/catch2/internal/catch_string_manip.hpp
+++ b/src/catch2/internal/catch_string_manip.hpp
@@ -7,7 +7,7 @@
 #ifndef TWOBLUECUBES_CATCH_STRING_MANIP_H_INCLUDED
 #define TWOBLUECUBES_CATCH_STRING_MANIP_H_INCLUDED
 
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <string>
 #include <iosfwd>
diff --git a/src/catch2/internal/catch_stringref.cpp b/src/catch2/internal/catch_stringref.cpp
index 53e224eb..4b0bbae6 100644
--- a/src/catch2/internal/catch_stringref.cpp
+++ b/src/catch2/internal/catch_stringref.cpp
@@ -6,7 +6,7 @@
  */
 
 #include <catch2/internal/catch_enforce.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <algorithm>
 #include <ostream>
diff --git a/src/catch2/catch_stringref.hpp b/src/catch2/internal/catch_stringref.hpp
similarity index 100%
rename from src/catch2/catch_stringref.hpp
rename to src/catch2/internal/catch_stringref.hpp
diff --git a/src/catch2/internal/catch_test_macro_impl.hpp b/src/catch2/internal/catch_test_macro_impl.hpp
index ffb767ed..effd5884 100644
--- a/src/catch2/internal/catch_test_macro_impl.hpp
+++ b/src/catch2/internal/catch_test_macro_impl.hpp
@@ -10,7 +10,7 @@
 
 #include <catch2/internal/catch_assertionhandler.hpp>
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 // We need this suppression to leak, because it took until GCC 9
 // for the front end to handle local suppression via _Pragma properly
diff --git a/src/catch2/internal/catch_test_registry.hpp b/src/catch2/internal/catch_test_registry.hpp
index def1de2d..8a027bd9 100644
--- a/src/catch2/internal/catch_test_registry.hpp
+++ b/src/catch2/internal/catch_test_registry.hpp
@@ -11,7 +11,7 @@
 #include <catch2/internal/catch_common.hpp>
 #include <catch2/interfaces/catch_interfaces_testcase.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <memory>
 
diff --git a/src/catch2/matchers/catch_matchers_templated.hpp b/src/catch2/matchers/catch_matchers_templated.hpp
index d1ca7813..34bef90e 100644
--- a/src/catch2/matchers/catch_matchers_templated.hpp
+++ b/src/catch2/matchers/catch_matchers_templated.hpp
@@ -6,7 +6,7 @@
 
 #include <catch2/internal/catch_common.hpp>
 #include <catch2/matchers/catch_matchers.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <array>
 #include <algorithm>
diff --git a/src/catch2/matchers/internal/catch_matchers_impl.hpp b/src/catch2/matchers/internal/catch_matchers_impl.hpp
index 9f706201..fe548265 100644
--- a/src/catch2/matchers/internal/catch_matchers_impl.hpp
+++ b/src/catch2/matchers/internal/catch_matchers_impl.hpp
@@ -6,7 +6,7 @@
 #define TWOBLUECUBES_CATCH_CAPTURE_MATCHERS_HPP_INCLUDED
 
 #include <catch2/internal/catch_test_macro_impl.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 namespace Catch {
 
diff --git a/src/catch2/reporters/catch_reporter_console.cpp b/src/catch2/reporters/catch_reporter_console.cpp
index a7cb9fb7..cb38318b 100644
--- a/src/catch2/reporters/catch_reporter_console.cpp
+++ b/src/catch2/reporters/catch_reporter_console.cpp
@@ -13,7 +13,7 @@
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/catch_version.hpp>
 #include <catch2/internal/catch_text.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <cfloat>
 #include <cstdio>
diff --git a/tests/SelfTest/IntrospectiveTests/String.tests.cpp b/tests/SelfTest/IntrospectiveTests/String.tests.cpp
index e616801c..8c57e583 100644
--- a/tests/SelfTest/IntrospectiveTests/String.tests.cpp
+++ b/tests/SelfTest/IntrospectiveTests/String.tests.cpp
@@ -1,5 +1,5 @@
 #include <catch2/catch_test_macros.hpp>
-#include <catch2/catch_stringref.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <cstring>