diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 977141881..827c88e0d 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1384,7 +1384,7 @@ class YoutubeDL(object):
                     requested_formats = info_dict['requested_formats']
                     if self.params.get('merge_output_format') is None and not compatible_formats(requested_formats):
                         filename = os.path.splitext(filename)[0] + '.mkv'
-                        self.report_warning('You have requested formats uncompatible for merge. '
+                        self.report_warning('You have requested formats incompatible for merge. '
                                             'The formats will be merged into mkv')
                     if os.path.exists(encodeFilename(filename)):
                         self.to_screen(