diff --git a/pkgs/development/python-modules/whisperx/default.nix b/pkgs/development/python-modules/whisperx/default.nix
index 5d6455de1321..235bca7af2fe 100644
--- a/pkgs/development/python-modules/whisperx/default.nix
+++ b/pkgs/development/python-modules/whisperx/default.nix
@@ -60,6 +60,7 @@ buildPythonPackage rec {
   build-system = [ setuptools ];
 
   pythonRelaxDeps = [
+    "av"
     "numpy"
     "pandas"
     "pyannote-audio"