diff --git a/no-compressed.nix b/no-compressed.nix
index f365e95..623cc37 100644
--- a/no-compressed.nix
+++ b/no-compressed.nix
@@ -20,4 +20,16 @@
       EFI n
     '';
   } ];
+
+  nixpkgs.overlays = [
+    (final: prev: {
+      # Fix GCC 13 format-overflow warning/error:
+      # ../src/shared/install.c:444:64: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
+      # 444 |                         err = log_error_errno(changes[i].type, "Failed to %s unit, unit %s does not exist.",
+      #     |                                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+      systemd = prev.systemd.overrideAttrs (old: {
+        CFLAGS = "-Wno-error=format-overflow";
+      });
+    })
+  ];
 }