diff --git a/src/catch2/catch_tostring.hpp b/src/catch2/catch_tostring.hpp
index 8fbe67a6..00893c46 100644
--- a/src/catch2/catch_tostring.hpp
+++ b/src/catch2/catch_tostring.hpp
@@ -28,9 +28,18 @@
 #pragma warning(disable:4180) // We attempt to stream a function (address) by const&, which MSVC complains about but is harmless
 #endif
 
+// We need a dummy global operator<< so we can bring it into Catch namespace later
+struct Catch_global_namespace_dummy{};
+std::ostream& operator<<(std::ostream&, Catch_global_namespace_dummy);
+
 namespace Catch {
+    // Bring in global namespace operator<< for ADL lookup in
+    // `IsStreamInsertable` below.
+    using ::operator<<;
+
     namespace Detail {
 
+
         constexpr StringRef unprintableString = "{?}"_sr;
 
         //! Encases `string in quotes, and optionally escapes invisibles
diff --git a/src/catch2/internal/catch_source_line_info.hpp b/src/catch2/internal/catch_source_line_info.hpp
index bd828fad..c6b98195 100644
--- a/src/catch2/internal/catch_source_line_info.hpp
+++ b/src/catch2/internal/catch_source_line_info.hpp
@@ -11,10 +11,6 @@
 #include <cstddef>
 #include <iosfwd>
 
-// We need a dummy global operator<< so we can bring it into Catch namespace later
-struct Catch_global_namespace_dummy {};
-std::ostream& operator<<(std::ostream&, Catch_global_namespace_dummy);
-
 namespace Catch {
 
     struct SourceLineInfo {
@@ -33,12 +29,6 @@ namespace Catch {
 
         friend std::ostream& operator << (std::ostream& os, SourceLineInfo const& info);
     };
-
-
-    // Bring in operator<< from global namespace into Catch namespace
-    // This is necessary because the overload of operator<< above makes
-    // lookup stop at namespace Catch
-    using ::operator<<;
 }
 
 #define CATCH_INTERNAL_LINEINFO \