diff --git a/fhem/FHEM/96_allowed.pm b/fhem/FHEM/96_allowed.pm
index d3270f45d..5ea3eb730 100755
--- a/fhem/FHEM/96_allowed.pm
+++ b/fhem/FHEM/96_allowed.pm
@@ -77,14 +77,15 @@ allowed_Authorize($$$$)
   if($type eq "cmd") {
     return 0 if(!$me->{allowedCommands});
     # Return 0: allow stacking with other instances, see Forum#46380
-    return ($me->{allowedCommands} =~ m/\b$arg\b/) ? 0 : 2;
+    return ($me->{allowedCommands} =~ m/\b\Q$arg\E\b/) ? 0 : 2;
   }
 
   if($type eq "devicename") {
     return 0 if(!$me->{allowedDevices});
-    return ($me->{allowedDevices} =~ m/\b$arg\b/) ? 0 : 2;
+    return ($me->{allowedDevices} =~ m/\b\Q$arg\E\b/) ? 0 : 2;
   }
 
+
   return 0;
 }