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-rw-r--r--pkgs/tools/networking/jwhois/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/networking/jwhois/default.nix b/pkgs/tools/networking/jwhois/default.nix
index 12494fc2699..9026a60e2f3 100644
--- a/pkgs/tools/networking/jwhois/default.nix
+++ b/pkgs/tools/networking/jwhois/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   # Work around error from <stdio.h> on aarch64-darwin:
   #     error: 'TARGET_OS_IPHONE' is not defined, evaluates to 0 [-Werror,-Wundef-prefix=TARGET_OS_]
   # TODO: this should probably be fixed at a lower level than this?
-  env.NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-Wno-undef-prefix";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-Wno-undef-prefix";
 
   meta = {
     description = "A client for the WHOIS protocol allowing you to query the owner of a domain name";