diff --git a/.rc.func.sh b/.rc.func.sh
index f35653a..59bc8fa 100644
--- a/.rc.func.sh
+++ b/.rc.func.sh
@@ -63,7 +63,7 @@ function ycclear() {
 }
 
 function goenv() {
-    if [ "$1" == "off" ]; then
+    if [ "x$1" = "xoff" ]; then
         go env -w GO111MODULE=off
     else
         go env -w GO111MODULE=on