diff --git a/lecturemunger.py b/lecturemunger.py
index 2fbf9dc..48b1ca3 100644
--- a/lecturemunger.py
+++ b/lecturemunger.py
@@ -141,7 +141,7 @@ def do():
                 # Extract audio, process it, add it back to the video
                 video_in = dest
                 processed_audio = os.path.join(processed_audio_dir, filename.split(".")[0] + ".wav")
-                final_output_name = os.path.join(final, filename)
+                final_output_name = os.path.join(final, filename.split(".")[0] + ".mp4")
                 do_command("New:")
                 do_command("Import2: Filename={}".format(video_in))
                 time.sleep(5)