diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index a89f6337f5f..86eb10d50b0 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -707,7 +707,7 @@ get_time_value(THD *thd, Item ***item_arg, Item **cache_arg,
   else
   {
     *is_null= item->get_time(&ltime);
-    value= !is_null ? TIME_to_ulonglong_datetime(&ltime) : 0;
+    value= !*is_null ? TIME_to_ulonglong_datetime(&ltime) : 0;
   }
   /*
     Do not cache GET_USER_VAR() function as its const_item() may return TRUE