diff --git a/client/mysqltest.c b/client/mysqltest.c
index 79df511641d1f5ef95a43e99dbfde01d2843e153..4f8e6cdac998c73580c17832c024d4141e5127c7 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -1406,7 +1406,7 @@ void show_diff(DYNAMIC_STRING* ds,
   else
     diff_name = 0;
 #else
-  diff_name = "diff";           // Otherwise always assume it's called diff
+  diff_name = "diff";           /* Otherwise always assume it's called diff */
 #endif
 
   if (diff_name)