diff --git a/src/if_tcl.c b/src/if_tcl.c
index 4838e31..75fa858 100644
--- a/src/if_tcl.c
+++ b/src/if_tcl.c
@@ -1308,7 +1308,7 @@
 
     option = (char_u *)Tcl_GetStringFromObj(objv[objn], NULL);
     ++objn;
-    gov = get_option_value(option, &lval, &sval, 0);
+    gov = get_option_value(option, &lval, &sval, NULL, 0);
     err = TCL_OK;
     switch (gov)
     {