diff --git a/pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix b/pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix
index d9b3dfb74049..aafc15429487 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix
@@ -14,7 +14,7 @@ appleDerivation {
       -Wl,-reexport_library -Wl,$out/lib/libcharset.dylib
   '';
 
-  setup-hook = ../../../../development/libraries/libiconv/setup-hook.sh;
+  setupHook = ../../../../development/libraries/libiconv/setup-hook.sh;
 
   meta = {
     platforms = stdenv.lib.platforms.darwin;