diff --git a/apps/gallery/lib/hooks_handlers.php b/apps/gallery/lib/hooks_handlers.php
index 7248e67f0a2cbe75b9aa62d4a0419a1225878573..53a924ff40abceef95488450da8e55b3604ce51a 100644
--- a/apps/gallery/lib/hooks_handlers.php
+++ b/apps/gallery/lib/hooks_handlers.php
@@ -32,10 +32,8 @@ class OC_Gallery_Hooks_Handlers {
   private static $APP_TAG = "Gallery";
 
   private static function isPhoto($filename) {
-    OC_Log::write(self::$APP_TAG, "Checking file ".$filename." with mimetype ".OC_Filesystem::getMimeType($filename), OC_Log::DEBUG);
-    if (substr(OC_Filesystem::getMimeType($filename), 0, 6) == "image/")
-      return true;
-    return false;
+    $ext = strtolower(substr($filename, strrpos($filename, '.')+1));
+    return $ext=='png' || $ext=='jpeg' || $ext=='jpg' || $ext=='gif';
   }
 
   private static function directoryContainsPhotos($dirpath) {
diff --git a/apps/gallery/lib/scanner.php b/apps/gallery/lib/scanner.php
index df33369b93bcce02bc05ba865c6e9d50f7779805..447174e84c0f3dd41ec587e137c941cc809f6adf 100644
--- a/apps/gallery/lib/scanner.php
+++ b/apps/gallery/lib/scanner.php
@@ -88,9 +88,8 @@ class OC_Gallery_Scanner {
   }
 
   public static function isPhoto($filename) {
-    if (substr(OC_Filesystem::getMimeType($filename), 0, 6) == "image/")
-      return 1;
-    return 0;
+    $ext = strtolower(substr($filename, strrpos($filename, '.')+1));
+    return $ext=='png' || $ext=='jpeg' || $ext=='jpg' || $ext=='gif';
   }
 
   public static function find_paths($path) {