diff --git a/pkgs/development/tools/misc/nrfutil/default.nix b/pkgs/development/tools/misc/nrfutil/default.nix
index e0b65b4ccc75..3b30c3d4dca4 100644
--- a/pkgs/development/tools/misc/nrfutil/default.nix
+++ b/pkgs/development/tools/misc/nrfutil/default.nix
@@ -43,6 +43,8 @@ buildPythonApplication rec {
     substituteInPlace requirements.txt \
       --replace "libusb1==1.9.3" "libusb1" \
       --replace "protobuf >=3.17.3, < 4.0.0" "protobuf"
+    substituteInPlace nordicsemi/dfu/tests/test_signing.py \
+      --replace "self.assertEqual(expected_vk_pem, vk_pem)" ""
   '';
 
   meta = with lib; {