diff --git a/src/catch2/internal/catch_compiler_capabilities.hpp b/src/catch2/internal/catch_compiler_capabilities.hpp
index 59839c17..2bbee6bc 100644
--- a/src/catch2/internal/catch_compiler_capabilities.hpp
+++ b/src/catch2/internal/catch_compiler_capabilities.hpp
@@ -114,6 +114,11 @@
              _Pragma( "clang diagnostic ignored \"-Wgnu-zero-variadic-macro-arguments\"" )
 #    endif
 
+#    if ( __clang_major__ >= 22 )
+#        define CATCH_INTERNAL_SUPPRESS_COUNTER_WARNINGS \
+            _Pragma( "clang diagnostic ignored \"-Wc2y-extensions\"" )
+#    endif
+
 #    define CATCH_INTERNAL_SUPPRESS_UNUSED_TEMPLATE_WARNINGS \
          _Pragma( "clang diagnostic ignored \"-Wunused-template\"" )
 
@@ -429,6 +434,9 @@
 #if !defined( CATCH_INTERNAL_SUPPRESS_SHADOW_WARNINGS )
 #    define CATCH_INTERNAL_SUPPRESS_SHADOW_WARNINGS
 #endif
+#if !defined( CATCH_INTERNAL_SUPPRESS_COUNTER_WARNINGS )
+#    define CATCH_INTERNAL_SUPPRESS_COUNTER_WARNINGS
+#endif
 
 #if defined(__APPLE__) && defined(__apple_build_version__) && (__clang_major__ < 10)
 #   undef CATCH_INTERNAL_SUPPRESS_UNUSED_TEMPLATE_WARNINGS
diff --git a/src/catch2/internal/catch_unique_name.hpp b/src/catch2/internal/catch_unique_name.hpp
index c6e1c2ca..b8c08fa2 100644
--- a/src/catch2/internal/catch_unique_name.hpp
+++ b/src/catch2/internal/catch_unique_name.hpp
@@ -8,9 +8,22 @@
 #ifndef CATCH_UNIQUE_NAME_HPP_INCLUDED
 #define CATCH_UNIQUE_NAME_HPP_INCLUDED
 
+#include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_config_counter.hpp>
+
+// Fixme: Clang 22 has an annoying bug where the localized suppression
+//        below does not actually suppress the extension warning from
+//        using __COUNTER__, so we have to leak the suppression for the
+//        whole TU. Hopefully Clang 23 fixes this before full release.
+//        As AppleClang does its own thing version-wise, we ignore it
+//        completely.
+#if defined( __clang__ ) && ( __clang_major__ >= 22 ) && !defined( __APPLE__ )
+CATCH_INTERNAL_SUPPRESS_COUNTER_WARNINGS
+#endif
+
 #define INTERNAL_CATCH_UNIQUE_NAME_LINE2( name, line ) name##line
 #define INTERNAL_CATCH_UNIQUE_NAME_LINE( name, line ) INTERNAL_CATCH_UNIQUE_NAME_LINE2( name, line )
+
 #ifdef CATCH_CONFIG_COUNTER
 #  define INTERNAL_CATCH_UNIQUE_NAME( name ) INTERNAL_CATCH_UNIQUE_NAME_LINE( name, __COUNTER__ )
 #else