diff --git a/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php b/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
index 9ab24b95..85476ac3 100644
--- a/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
+++ b/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
@@ -29,6 +29,11 @@ abstract class AbstractRetriever implements UriRetrieverInterface
      */
     public function getContentType()
     {
-        return $this->contentType;
+        if(empty($this->contentType)){
+            return $this->contentType;
+        }
+
+        // return cleaned content type
+        return preg_replace('|(?<=json)(.*)|','',$this->contentType);
     }
 }