diff --git a/pkgs/development/python-modules/cffi/default.nix b/pkgs/development/python-modules/cffi/default.nix
index 4f9cb3439726..83c955b3c1c0 100644
--- a/pkgs/development/python-modules/cffi/default.nix
+++ b/pkgs/development/python-modules/cffi/default.nix
@@ -56,7 +56,7 @@ else
           hash = "sha256-H5rFgRRTr27l5S6REo8+7dmPDQW7WXhP4f4DGZjdi+s=";
         })
       ]
-      ++ lib.optionals (stdenv.cc.isClang && (ccVersion == "boot" || lib.versionAtLeast (lib.getVersion stdenv.cc) "13")) [
+      ++ lib.optionals (stdenv.cc.isClang && (ccVersion == "boot" || lib.versionAtLeast ccVersion "13")) [
         # -Wnull-pointer-subtraction is enabled with -Wextra. Suppress it to allow the following tests
         # to run and pass when cffi is built with newer versions of clang (including the bootstrap tools clang on Darwin):
         # - testing/cffi1/test_verify1.py::test_enum_usage