diff --git a/pkgs/development/python-modules/mobly/default.nix b/pkgs/development/python-modules/mobly/default.nix
index dc76a6d6ea09..c4d400cae107 100644
--- a/pkgs/development/python-modules/mobly/default.nix
+++ b/pkgs/development/python-modules/mobly/default.nix
@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   buildPythonPackage,
   fetchFromGitHub,
 
@@ -47,6 +48,13 @@ buildPythonPackage rec {
     pytz
   ];
 
+  disabledTests = lib.optionals stdenv.hostPlatform.isDarwin [
+    # cannot access /usr/bin/pgrep from the sandbox
+    "test_stop_standing_subproc"
+    "test_stop_standing_subproc_and_descendants"
+    "test_stop_standing_subproc_without_pipe"
+  ];
+
   __darwinAllowLocalNetworking = true;
 
   meta = with lib; {