diff --git a/test/plugins/test_convert.py b/test/plugins/test_convert.py
index 6dd28337a..ce3f159e6 100644
--- a/test/plugins/test_convert.py
+++ b/test/plugins/test_convert.py
@@ -293,6 +293,17 @@ class ConvertCliTest(ConvertTestCase, ConvertCommand):
         m3u_created = os.path.join(self.convert_dest, b"playlist.m3u8")
         assert not os.path.exists(m3u_created)
 
+    def test_playlist_ext(self):
+        """Test correct extension of file inside the playlist when format conversion occurs."""
+        # We expect a converted file with the MP3 extension.
+        self.config["convert"]["format"] = "mp3"
+        with control_stdin("y"):
+            self.run_convert("--playlist", "playlist.m3u8")
+            # Check playlist content.
+            m3u_created = os.path.join(self.convert_dest, b"playlist.m3u8")
+            with open(m3u_created, "r") as m3u_file:
+                self.assertTrue(m3u_file.readline() == "#EXTM3U\n")
+                self.assertTrue(m3u_file.readline() == "converted.mp3\n")
 
 @_common.slow_test()
 class NeverConvertLossyFilesTest(ConvertTestCase, ConvertCommand):