diff --git a/base/shell/cmd/for.c b/base/shell/cmd/for.c
index 151be0ca2c8..adb0c5be89f 100644
--- a/base/shell/cmd/for.c
+++ b/base/shell/cmd/for.c
@@ -474,6 +474,7 @@ Quit:
     if (fc->values && (fc->values != Variables))
         cmd_free(fc->values);
 #endif
+    fc->values = NULL;
 
     return Ret;
 }