1 files changed, 1 insertions, 1 deletions
diff --git a/x11perf.c b/x11perf.c
index eacea0d..e20de88 100644
--- a/x11perf.c
+++ b/x11perf.c
@@ -336,7 +336,7 @@ missing_arg(const char *option)
 _X_NORETURN _X_COLD static void
 invalid_arg( const char *arg, const char *option)
 {
-    fprintf(stderr, "Error: invalid argument to %s\n", arg, option);
+    fprintf(stderr, "Error: invalid argument '%s' to %s\n", arg, option);
     usage(USAGE_OPTIONS, EXIT_FAILURE);
 }