diff --git a/pkgs/development/python-modules/flake8-future-import/default.nix b/pkgs/development/python-modules/flake8-future-import/default.nix
index 7a3f4dbd805a..e4549470d953 100644
--- a/pkgs/development/python-modules/flake8-future-import/default.nix
+++ b/pkgs/development/python-modules/flake8-future-import/default.nix
@@ -33,6 +33,11 @@ buildPythonPackage rec {
     ./skip-test.patch
   ];
 
+  postPatch = ''
+    substituteInPlace "test_flake8_future_import.py" \
+      --replace "'flake8'" "'${lib.getExe flake8}'"
+  '';
+
   propagatedBuildInputs = [ flake8 ];
 
   nativeCheckInputs = [ six ];