diff --git a/src/catch2/internal/catch_unreachable.hpp b/src/catch2/internal/catch_unreachable.hpp
index 02cca494..fc3f75b5 100644
--- a/src/catch2/internal/catch_unreachable.hpp
+++ b/src/catch2/internal/catch_unreachable.hpp
@@ -39,9 +39,13 @@ namespace Catch {
             __assume( false );
 #        elif defined( __GNUC__ )
             __builtin_unreachable();
-#        endif
-#    endif // ^^ NDEBUG
+#        else // vv platform without known optimization hint
             std::terminate();
+#        endif
+#    else  // ^^ NDEBUG
+            // For non-release builds, we prefer termination on bug over UB
+            std::terminate();
+#    endif //
         }
 
     } // namespace Detail