diff --git a/cutout/src/main/java/com/github/gabrielbb/cutout/SaveDrawingTask.java b/cutout/src/main/java/com/github/gabrielbb/cutout/SaveDrawingTask.java
index 6907baa..9eb5ac8 100644
--- a/cutout/src/main/java/com/github/gabrielbb/cutout/SaveDrawingTask.java
+++ b/cutout/src/main/java/com/github/gabrielbb/cutout/SaveDrawingTask.java
@@ -18,7 +18,7 @@
 
 class SaveDrawingTask extends AsyncTask<Bitmap, Void, Pair<File, Exception>> {
 
-    private static final String SAVED_IMAGE_FORMAT = "png";
+    private static final String SAVED_IMAGE_FORMAT = ".png";
     private static final String SAVED_IMAGE_NAME = "cutout_tmp";
 
     private final WeakReference<CutOutActivity> activityWeakReference;
@@ -64,4 +64,4 @@ protected void onPostExecute(Pair<File, Exception> result) {
             activityWeakReference.get().exitWithError(result.second);
         }
     }
-}
\ No newline at end of file
+}