diff --git a/Imagine/Filter/RelativeResize.php b/Imagine/Filter/RelativeResize.php
index 918b7e27b..fde36bdaa 100644
--- a/Imagine/Filter/RelativeResize.php
+++ b/Imagine/Filter/RelativeResize.php
@@ -36,7 +36,7 @@ class RelativeResize implements FilterInterface
     public function __construct($method, $parameter)
     {
         if (!\in_array($method, ['heighten', 'increase', 'scale', 'widen'], true)) {
-            throw new InvalidArgumentException(sprintf('Unsupported method: ', $method));
+            throw new InvalidArgumentException(sprintf('Unsupported method: %s', $method));
         }
 
         $this->method = $method;