diff --git a/acme.sh b/acme.sh
index 81a20b0b..4a1ce9b7 100755
--- a/acme.sh
+++ b/acme.sh
@@ -6362,11 +6362,17 @@ _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
-      #it's a normal user doing "sudo su", or `sudo -i` or `sudo -s`
-      #fine
-      return 0
-    fi
+    case "$SUDO_COMMAND" in
+      */su )
+        #it's a normal user doing `sudo su`, no problem
+        return 0 ;;
+    esac
+    for i in `cat /etc/shells`; do
+      if [ "$SUDO_COMMAND" = "$i" ]; then
+        #it's a normal user running `sudo -i` or `sudo -s`, fine
+        return 0
+      fi
+    done
     #otherwise
     return 1
   fi