diff --git a/src/Licensing/Outpost.php b/src/Licensing/Outpost.php
index 32ffba1daa..4385a2c078 100644
--- a/src/Licensing/Outpost.php
+++ b/src/Licensing/Outpost.php
@@ -199,7 +199,7 @@ private function cacheAndReturnValidationResponse($e)
 
     private function cacheAndReturnRateLimitResponse($e)
     {
-        $seconds = $e->getResponse()->getHeader('Retry-After')[0];
+        $seconds = (int) $e->getResponse()->getHeader('Retry-After')[0];
 
         return $this->cacheResponse(now()->addSeconds($seconds), ['error' => 429]);
     }