diff --git a/lib/version.sh b/lib/version.sh
index 5319629..899aa68 100644
--- a/lib/version.sh
+++ b/lib/version.sh
@@ -59,6 +59,8 @@ set_sys_vars()
     export SYS_VER=$3
     if [[ $4 != "null" ]]; then
         export SYS_CODE=$4
+    elif [[ -n $SYS_CODE ]]; then
+        unset SYS_CODE
     fi
 }
 export -f get_os_version