diff --git a/pkgs/development/python-modules/captum/default.nix b/pkgs/development/python-modules/captum/default.nix
index 32889473641c..455eac5c5fc1 100644
--- a/pkgs/development/python-modules/captum/default.nix
+++ b/pkgs/development/python-modules/captum/default.nix
@@ -2,7 +2,6 @@
   lib,
   stdenv,
   fetchFromGitHub,
-  fetchpatch,
   buildPythonPackage,
   pytestCheckHook,
   setuptools,
@@ -53,6 +52,10 @@ buildPythonPackage rec {
     scikit-learn
   ];
 
+  preCheck = ''
+    export OMP_NUM_THREADS=1
+  '';
+
   disabledTestPaths =
     lib.optionals stdenv.hostPlatform.isDarwin [
       # These tests may fail if multiple builds run them at the same time due