diff --git a/pkgs/development/python-modules/google-crc32c/default.nix b/pkgs/development/python-modules/google-crc32c/default.nix
index 282cb7d325c6..64e2b4bdfae2 100644
--- a/pkgs/development/python-modules/google-crc32c/default.nix
+++ b/pkgs/development/python-modules/google-crc32c/default.nix
@@ -29,8 +29,10 @@ buildPythonPackage rec {
 
   dependencies = [ cffi ];
 
-  LDFLAGS = "-L${crc32c}/lib";
-  CFLAGS = "-I${crc32c}/include";
+  env = {
+    LDFLAGS = "-L${crc32c}/lib";
+    CFLAGS = "-I${crc32c}/include";
+  };
 
   nativeCheckInputs = [
     pytestCheckHook