diff --git a/jsm.inc.php b/jsm.inc.php
index b6fee16..55c1b3d 100644
--- a/jsm.inc.php
+++ b/jsm.inc.php
@@ -457,7 +457,7 @@ class JSM
   private function _extractDefNameAndArgs(string $full_name) : array
   {
     $pos = strpos($full_name, '(');
-    if($pos == -1)
+    if($pos === false)
       throw new Exception("Bad args string: $full_name");
     $name = substr($full_name, 0, $pos);