diff --git a/lib/private/preview/unknown.php b/lib/private/preview/unknown.php
index 9c1d41bef5..fa2d4980a8 100644
--- a/lib/private/preview/unknown.php
+++ b/lib/private/preview/unknown.php
@@ -21,7 +21,7 @@ class Unknown extends Provider {
 		$path = \OC::$SERVERROOT . substr($path, strlen(\OC::$WEBROOT));
 
 		if (extension_loaded('imagick')) {
-				$path = substr_replace($path, 'png', -3);
+				$path = substr_replace($path, 'svg', -3);
 				$content = file_get_contents($path);
 
 				$svg = new \Imagick();
@@ -39,4 +39,4 @@ class Unknown extends Provider {
 	}
 }
 
-\OC\Preview::registerProvider('OC\Preview\Unknown');
\ No newline at end of file
+\OC\Preview::registerProvider('OC\Preview\Unknown');