diff --git a/tools/shell/src/shellAuto.c b/tools/shell/src/shellAuto.c
index 48ecf976220249b97828124904916a060bcd7ae3..14b85d4d3ded2bf343d26fe3f1035efae4865251 100644
--- a/tools/shell/src/shellAuto.c
+++ b/tools/shell/src/shellAuto.c
@@ -1705,7 +1705,7 @@ bool matchEnd(TAOS* con, SShellCmd* cmd) {
   }
 
   // match database
-  if(elast == NUL) {
+  if(elast == NULL) {
     // dot need not completed with dbname
     if (fillWithType(con, cmd, last, WT_VAR_DBNAME)) {
       ret = true;