diff --git a/src/catch2/catch_config.cpp b/src/catch2/catch_config.cpp
index 6d579af4..ea7ec3de 100644
--- a/src/catch2/catch_config.cpp
+++ b/src/catch2/catch_config.cpp
@@ -7,6 +7,7 @@
 
 #include <catch2/catch_config.hpp>
 #include <catch2/catch_enforce.h>
+#include <catch2/catch_stream.h>
 #include <catch2/catch_stringref.h>
 
 namespace Catch {
@@ -36,6 +37,9 @@ namespace Catch {
         m_testSpec = parser.testSpec();
     }
 
+    Config::~Config() = default;
+
+
     std::string const& Config::getFilename() const {
         return m_data.outputFilename ;
     }
diff --git a/src/catch2/catch_config.hpp b/src/catch2/catch_config.hpp
index 85a7c84c..55fa5ed8 100644
--- a/src/catch2/catch_config.hpp
+++ b/src/catch2/catch_config.hpp
@@ -11,9 +11,6 @@
 #include <catch2/catch_test_spec_parser.h>
 #include <catch2/catch_interfaces_config.h>
 
-// Libstdc++ doesn't like incomplete classes for unique_ptr
-#include <catch2/catch_stream.h>
-
 #include <memory>
 #include <vector>
 #include <string>
@@ -73,7 +70,7 @@ namespace Catch {
 
         Config() = default;
         Config( ConfigData const& data );
-        virtual ~Config() = default;
+        ~Config() override; // = default in the cpp file
 
         std::string const& getFilename() const;