diff --git a/pkgs/tools/admin/simp_le/default.nix b/pkgs/tools/admin/simp_le/default.nix
index 91656eb0c55..b618e71568d 100644
--- a/pkgs/tools/admin/simp_le/default.nix
+++ b/pkgs/tools/admin/simp_le/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, fetchpatch, pythonPackages }:
+{ stdenv, fetchFromGitHub, fetchpatch, pythonPackages, bash }:
  
 pythonPackages.buildPythonApplication rec {
   pname = "simp_le-client";
@@ -9,6 +9,11 @@ pythonPackages.buildPythonApplication rec {
     sha256 = "0nv9mm99rm8i9flgfgwvmajbsxb5rm162nfxlq3wk66bbbyr6y1i";
   };
 
+  postPatch = ''
+    substituteInPlace simp_le.py \
+      --replace "/bin/sh" "${bash}/bin/sh"
+  '';
+
   checkPhase = ''
     $out/bin/simp_le --test
   '';