diff --git a/pkgs/development/libraries/gettext/default.nix b/pkgs/development/libraries/gettext/default.nix
index 19a3a0f18b3..eea4e45a946 100644
--- a/pkgs/development/libraries/gettext/default.nix
+++ b/pkgs/development/libraries/gettext/default.nix
@@ -70,11 +70,11 @@ stdenv.mkDerivation (rec {
   };
 }
 
-// optionalAttrs stdenv.isDarwin {
+// stdenv.lib.optionalAttrs stdenv.isDarwin {
   makeFlags = "CFLAGS=-D_FORTIFY_SOURCE=0";
 }
 
-// optionalAttrs stdenv.isCygwin {
+// stdenv.lib.optionalAttrs stdenv.isCygwin {
   patchPhase =
    # Make sure `error.c' gets compiled and is part of `libgettextlib.la'.
    # This fixes: