diff --git a/pkgs/tools/networking/curl/default.nix b/pkgs/tools/networking/curl/default.nix
index 984a6ecaaef8..d14b1156670f 100644
--- a/pkgs/tools/networking/curl/default.nix
+++ b/pkgs/tools/networking/curl/default.nix
@@ -7,7 +7,7 @@
 , gnutlsSupport ? false, gnutls ? null
 , wolfsslSupport ? false, wolfssl ? null
 , scpSupport ? zlibSupport && !stdenv.isSunOS && !stdenv.isCygwin, libssh2 ? null
-, gssSupport ? with stdenv.hostPlatform; !(
+, gssSupport ? with stdenv.hostPlatform; (
     !isWindows &&
     # a very sad story re static: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=439039
     !isStatic &&