diff --git a/source/helper.c b/source/helper.c
index a0a9902b..6908f1ef 100644
--- a/source/helper.c
+++ b/source/helper.c
@@ -498,7 +498,7 @@ int config_sanity_check ( void )
                 }
             }
             g_string_append_printf ( msg, "\t<b>config.monitor</b>=%s Could not find monitor.\n", name );
-            ssize = 0;
+            found_error = TRUE;
         }
         // Have todo an estimate here.
         if ( ( 2 * ( config.padding + config.menu_bw ) ) > ( 0.9 * ssize ) ) {