diff --git a/roop/ui.py b/roop/ui.py
index e36a160..d89bc11 100644
--- a/roop/ui.py
+++ b/roop/ui.py
@@ -158,9 +158,9 @@ def select_output_path(start: Callable[[], None]) -> None:
     global RECENT_DIRECTORY_OUTPUT
 
     if is_image(roop.globals.target_path):
-        output_path = ctk.filedialog.asksaveasfilename(title='save image output file', initialfile='output.png', initialdir=RECENT_DIRECTORY_OUTPUT)
+        output_path = ctk.filedialog.asksaveasfilename(title='save image output file', defaultextension='.png', initialfile='output.png', initialdir=RECENT_DIRECTORY_OUTPUT)
     elif is_video(roop.globals.target_path):
-        output_path = ctk.filedialog.asksaveasfilename(title='save video output file', initialfile='output.mp4', initialdir=RECENT_DIRECTORY_OUTPUT)
+        output_path = ctk.filedialog.asksaveasfilename(title='save video output file', defaultextension='.mp4', initialfile='output.mp4', initialdir=RECENT_DIRECTORY_OUTPUT)
     else:
         output_path = None
     if output_path: