diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 6551f086f..c25353eaf 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1659,8 +1659,8 @@ class YoutubeDL(object):
                     requested_formats = info_dict['requested_formats']
                     if self.params.get('merge_output_format') is None and not compatible_formats(requested_formats):
                         info_dict['ext'] = 'mkv'
-                        self.report_warning(
-                            'Requested formats are incompatible for merge and will be merged into mkv.')
+                        self.to_screen(
+                            '[info] Requested formats are incompatible for merge and will be merged into mkv.')
                     # Ensure filename always has a correct extension for successful merge
                     filename = '%s.%s' % (filename_wo_ext, info_dict['ext'])
                     if os.path.exists(encodeFilename(filename)):