diff --git a/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp b/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp
index f6e75cc2d3a0..3f18cd45e564 100644
--- a/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp
+++ b/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp
@@ -48,9 +48,9 @@ protected:
       // Example error handling.
       if (args[i] == "-an-error") {
         DiagnosticsEngine &D = CI.getDiagnostics();
-        unsigned DiagID = D.getCustomDiagID(
-          DiagnosticsEngine::Error, "invalid argument '" + args[i] + "'");
-        D.Report(DiagID);
+        unsigned DiagID = D.getCustomDiagID(DiagnosticsEngine::Error,
+                                            "invalid argument '%0'");
+        D.Report(DiagID) << args[i];
         return false;
       }
     }