diff --git a/src/catch2/interfaces/catch_interfaces_capture.hpp b/src/catch2/interfaces/catch_interfaces_capture.hpp
index 2a469c12..c3c80d75 100644
--- a/src/catch2/interfaces/catch_interfaces_capture.hpp
+++ b/src/catch2/interfaces/catch_interfaces_capture.hpp
@@ -84,7 +84,7 @@ namespace Catch {
                     AssertionReaction& reaction ) = 0;
         virtual void handleUnexpectedInflightException
                 (   AssertionInfo const& info,
-                    std::string const& message,
+                    std::string&& message,
                     AssertionReaction& reaction ) = 0;
         virtual void handleIncomplete
                 (   AssertionInfo const& info ) = 0;
diff --git a/src/catch2/internal/catch_run_context.cpp b/src/catch2/internal/catch_run_context.cpp
index 08086b28..e9cb025e 100644
--- a/src/catch2/internal/catch_run_context.cpp
+++ b/src/catch2/internal/catch_run_context.cpp
@@ -619,13 +619,13 @@ namespace Catch {
 
     void RunContext::handleUnexpectedInflightException(
             AssertionInfo const& info,
-            std::string const& message,
+            std::string&& message,
             AssertionReaction& reaction
     ) {
         m_lastAssertionInfo = info;
 
         AssertionResultData data( ResultWas::ThrewException, LazyExpression( false ) );
-        data.message = message;
+        data.message = CATCH_MOVE(message);
         AssertionResult assertionResult{ info, CATCH_MOVE(data) };
         assertionEnded( assertionResult );
         populateReaction( reaction );
diff --git a/src/catch2/internal/catch_run_context.hpp b/src/catch2/internal/catch_run_context.hpp
index 3928180e..cf166f63 100644
--- a/src/catch2/internal/catch_run_context.hpp
+++ b/src/catch2/internal/catch_run_context.hpp
@@ -59,7 +59,7 @@ namespace Catch {
                     AssertionReaction& reaction ) override;
         void handleUnexpectedInflightException
                 (   AssertionInfo const& info,
-                    std::string const& message,
+                    std::string&& message,
                     AssertionReaction& reaction ) override;
         void handleIncomplete
                 (   AssertionInfo const& info ) override;