diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 50e515d7179..5c08127bfdc 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -1990,7 +1990,7 @@ mysql_execute_command(void)
     }
     /* Fix lock for first table */
     if (tables->lock_type == TL_WRITE_DELAYED)
-      tables->lock_type == TL_WRITE;
+      tables->lock_type= TL_WRITE;
 
     /* Don't unlock tables until command is written to binary log */
     select_lex->options|= SELECT_NO_UNLOCK;