diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 80c2679d05cf..1d8998ab063f 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -180,7 +180,7 @@ in
         buildInputs = self.buildInputs ++ self.propagatedBuildInputs;
         nativeBuildInputs = self.nativeBuildInputs;
 
-        phases = [ "installPhase" "installCheckPhase" ];
+        dontUnpack = true;
 
         installPhase = ''
           runHook preInstall