diff --git a/src/catch2/interfaces/catch_interfaces_capture.hpp b/src/catch2/interfaces/catch_interfaces_capture.hpp
index a1876a4c..2b23e29a 100644
--- a/src/catch2/interfaces/catch_interfaces_capture.hpp
+++ b/src/catch2/interfaces/catch_interfaces_capture.hpp
@@ -77,7 +77,7 @@ namespace Catch {
         virtual void handleMessage
                 (   AssertionInfo const& info,
                     ResultWas::OfType resultType,
-                    StringRef message,
+                    std::string&& message,
                     AssertionReaction& reaction ) = 0;
         virtual void handleUnexpectedExceptionNotThrown
                 (   AssertionInfo const& info,
diff --git a/src/catch2/internal/catch_assertion_handler.cpp b/src/catch2/internal/catch_assertion_handler.cpp
index f650a707..9a28e79c 100644
--- a/src/catch2/internal/catch_assertion_handler.cpp
+++ b/src/catch2/internal/catch_assertion_handler.cpp
@@ -28,8 +28,8 @@ namespace Catch {
     void AssertionHandler::handleExpr( ITransientExpression const& expr ) {
         m_resultCapture.handleExpr( m_assertionInfo, expr, m_reaction );
     }
-    void AssertionHandler::handleMessage(ResultWas::OfType resultType, StringRef message) {
-        m_resultCapture.handleMessage( m_assertionInfo, resultType, message, m_reaction );
+    void AssertionHandler::handleMessage(ResultWas::OfType resultType, std::string&& message) {
+        m_resultCapture.handleMessage( m_assertionInfo, resultType, CATCH_MOVE(message), m_reaction );
     }
 
     auto AssertionHandler::allowThrows() const -> bool {
diff --git a/src/catch2/internal/catch_assertion_handler.hpp b/src/catch2/internal/catch_assertion_handler.hpp
index 01dd7801..098ed7a9 100644
--- a/src/catch2/internal/catch_assertion_handler.hpp
+++ b/src/catch2/internal/catch_assertion_handler.hpp
@@ -47,7 +47,7 @@ namespace Catch {
         }
         void handleExpr( ITransientExpression const& expr );
 
-        void handleMessage(ResultWas::OfType resultType, StringRef message);
+        void handleMessage(ResultWas::OfType resultType, std::string&& message);
 
         void handleExceptionThrownAsExpected();
         void handleUnexpectedExceptionNotThrown();
diff --git a/src/catch2/internal/catch_run_context.cpp b/src/catch2/internal/catch_run_context.cpp
index 00861968..2a102fbe 100644
--- a/src/catch2/internal/catch_run_context.cpp
+++ b/src/catch2/internal/catch_run_context.cpp
@@ -632,13 +632,13 @@ namespace Catch {
     void RunContext::handleMessage(
             AssertionInfo const& info,
             ResultWas::OfType resultType,
-            StringRef message,
+            std::string&& message,
             AssertionReaction& reaction
     ) {
         m_lastAssertionInfo = info;
 
         AssertionResultData data( resultType, LazyExpression( false ) );
-        data.message = static_cast<std::string>(message);
+        data.message = CATCH_MOVE( message );
         AssertionResult assertionResult{ m_lastAssertionInfo,
                                          CATCH_MOVE( data ) };
 
diff --git a/src/catch2/internal/catch_run_context.hpp b/src/catch2/internal/catch_run_context.hpp
index f7f353e2..c66fec0c 100644
--- a/src/catch2/internal/catch_run_context.hpp
+++ b/src/catch2/internal/catch_run_context.hpp
@@ -55,7 +55,7 @@ namespace Catch {
         void handleMessage
                 (   AssertionInfo const& info,
                     ResultWas::OfType resultType,
-                    StringRef message,
+                    std::string&& message,
                     AssertionReaction& reaction ) override;
         void handleUnexpectedExceptionNotThrown
                 (   AssertionInfo const& info,