diff --git a/pkgs/tools/misc/yubikey-manager/default.nix b/pkgs/tools/misc/yubikey-manager/default.nix
index 12b3aa0f05f..c50100eeb84 100644
--- a/pkgs/tools/misc/yubikey-manager/default.nix
+++ b/pkgs/tools/misc/yubikey-manager/default.nix
@@ -1,5 +1,5 @@
 { python3Packages, fetchurl, lib,
-  yubikey-personalization, libu2f-host, libusb1 }:
+  yubikey-personalization, libu2f-host, libusb1, procps }:
 
 python3Packages.buildPythonPackage rec {
   pname = "yubikey-manager";
@@ -10,6 +10,11 @@ python3Packages.buildPythonPackage rec {
     hash = "sha256-OxbKo5vwOBabU6/2hO4RMWiifo4IVIxz+DlcwP9xO/E=";
   };
 
+  postPatch = ''
+    substituteInPlace "ykman/pcsc/__init__.py" \
+      --replace '/usr/bin/pkill' '${procps}/bin/pkill'
+  '';
+
   propagatedBuildInputs =
     with python3Packages; [
       click