diff --git a/pkgs/tools/audio/tts/default.nix b/pkgs/tools/audio/tts/default.nix
index 338bbad19e4..1634bfa5b30 100644
--- a/pkgs/tools/audio/tts/default.nix
+++ b/pkgs/tools/audio/tts/default.nix
@@ -107,6 +107,7 @@ python3Packages.buildPythonApplication rec {
     inflect
     gdown
     pysbd
+    pyworld
   ];
 
   postInstall = ''