diff --git a/pkgs/development/interpreters/php/default.nix b/pkgs/development/interpreters/php/default.nix
index 5d20a0ee8c8dc5..5dfd1b85567a66 100644
--- a/pkgs/development/interpreters/php/default.nix
+++ b/pkgs/development/interpreters/php/default.nix
@@ -23,8 +23,7 @@ let
 
       configureFlags = [
         "EXTENSION_DIR=$(out)/lib/php/extensions"
-        "--with-iconv=${libiconv}"
-      ];
+      ] ++ lib.optional stdenv.isDarwin "--with-iconv=${libiconv}";
 
       flags = {