diff --git a/src/Google/AccessToken/Verify.php b/src/Google/AccessToken/Verify.php
index 09d71b9dd..bc0afcb39 100644
--- a/src/Google/AccessToken/Verify.php
+++ b/src/Google/AccessToken/Verify.php
@@ -211,8 +211,8 @@ private function getJwtService()
       $jwtClass = 'Firebase\JWT\JWT';
     }
 
-    if (property_exists($jwtClass, 'leeway')) {
-      // adds 1 second to JWT leeway
+    if (property_exists($jwtClass, 'leeway') && $jwtClass::$leeway < 1) {
+      // Ensures JWT leeway is at least 1
       // @see https://github.com/google/google-api-php-client/issues/827
       $jwtClass::$leeway = 1;
     }