diff --git a/pkgs/applications/misc/mob/default.nix b/pkgs/applications/misc/mob/default.nix
index f6490906b55e..2b9c847bac8f 100644
--- a/pkgs/applications/misc/mob/default.nix
+++ b/pkgs/applications/misc/mob/default.nix
@@ -1,8 +1,8 @@
 { lib
 , buildGoPackage
 , fetchFromGitHub
-
-, withSpeech ? true
+, stdenv
+, withSpeech ? !stdenv.isDarwin
 , makeWrapper
 , espeak-ng
 }: