diff --git a/acme.sh b/acme.sh
index f766ef2f..39e0af16 100755
--- a/acme.sh
+++ b/acme.sh
@@ -6448,10 +6448,10 @@ _checkSudo() {
       #it's root using sudo, no matter it's using sudo or not, just fine
       return 0
     fi
-    if [ "$SUDO_COMMAND" = "/bin/su" ] || [ "$SUDO_COMMAND" = "/bin/bash" ]; then
+    if [ -n "$SUDO_COMMAND" ]; then
       #it's a normal user doing "sudo su", or `sudo -i` or `sudo -s`
-      #fine
-      return 0
+      _endswith "$SUDO_COMMAND" /bin/su || grep "^$SUDO_COMMAND\$" /etc/shells >/dev/null 2>&1
+      return $?
     fi
     #otherwise
     return 1