diff --git a/pkgs/development/python-modules/sh/default.nix b/pkgs/development/python-modules/sh/default.nix
index 4f473cfb0268..797847b527fb 100644
--- a/pkgs/development/python-modules/sh/default.nix
+++ b/pkgs/development/python-modules/sh/default.nix
@@ -38,7 +38,9 @@ buildPythonPackage rec {
     "test_unicode_path"
     # fails to import itself after modifying the environment
     "test_environment"
-    # timing sensitive through usage of sleep(1) and signal handling
+    # timing sensitive due to strict timeouts
+    "test_done_callback_no_deadlock"
+    "test_timeout_overstep"
   ]
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     # Disable tests that fail on Darwin sandbox