diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index 77852088bd..af01942064 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -308,6 +308,11 @@ class BuildTest(unittest.TestCase):
         m.close()
         self.assertEqual(winutil.parse_cmdline('"c:\\test exe.exe" "some arg" 2'), ('c:\\test exe.exe', 'some arg', '2'))
 
+    def test_ffmpeg(self):
+        from calibre_extensions.ffmpeg import resample_raw_audio_16bit
+        data = os.urandom(22050 * 2)
+        resample_raw_audio_16bit(data, 22050, 44100)
+
     def test_sqlite(self):
         import sqlite3
         conn = sqlite3.connect(':memory:')