diff --git a/lib/systems/default.nix b/lib/systems/default.nix
index 77e7a8f99ef4..2bd3f8927277 100644
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -161,14 +161,12 @@ let
             (with final; isWindows && isAarch64);
 
         # Use the split GCC package set (`gccNGPackages`) instead of the
-        # monolithic `gcc`. No platform selects it yet; it is opt-in, set
-        # explicitly on a platform spec, so that the split set can be exercised
-        # before anything depends on it.
+        # monolithic `gcc`.
         #
-        # I (@Ericson2314) plan on making obscure low-tier platforms (e.g.
-        # NetBSD) use it soon, so we can dogfood GCC NG and thereby iron out its
-        # bugs.
-        useGccNG = false;
+        # I (@Ericson2314) plan on making more obscure low-tier
+        # platforms (e.g. NetBSD) use it soon, so we can dogfood GCC NG
+        # and thereby iron out its bugs.
+        useGccNG = final.isCygwin;
 
         libc =
           if final.isDarwin then