diff --git a/classes/MarketImage.class.php b/classes/MarketImage.class.php
index e2ae574505296fac7b0198605b60c17ba7a4a916..1e87af1759096a0db04c325b0d6fefce206fa01b 100644
--- a/classes/MarketImage.class.php
+++ b/classes/MarketImage.class.php
@@ -44,9 +44,9 @@ class MarketImage extends SimpleORMap {
     }
 
     public function outputImage() {
-        $path = self::getImageDataPath()."/".$this->getId();
-        header("Content-Type: ".$this['mimetype']);
-        header("Content-Disposition: inline; filename=".$this['filename']);
+        $path = self::getImageDataPath() . "/" . $this->getId();
+        header("Content-Type: " . mime_content_type($path));
+        header("Content-Disposition: inline; filename=" . $this['filename']);
         echo file_get_contents($path);
     }
 }
\ No newline at end of file
diff --git a/plugin.manifest b/plugin.manifest
index f6c82a4bdfed7e9a9c00a496040337c9bc1549e2..12feb62c47f63269d2c525370be0894125fc5d3f 100644
--- a/plugin.manifest
+++ b/plugin.manifest
@@ -1,4 +1,4 @@
 pluginname=PluginMarktplatz
 pluginclassname=PluginMarket
 origin=studip
-version=1.0.10
\ No newline at end of file
+version=1.0.11