diff --git a/sql/client_settings.h b/sql/client_settings.h
index d6a157f71fd..1397c1f1e23 100644
--- a/sql/client_settings.h
+++ b/sql/client_settings.h
@@ -37,7 +37,7 @@
                              CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA | \
                              CLIENT_CONNECT_ATTRS)
 
-#define read_user_name(A) {}
+#define read_user_name(A) {strmov(A,"");}
 #undef _CUSTOMCONFIG_
 
 #define mysql_server_init(a,b,c) mysql_client_plugin_init()