diff --git a/lib/modules.nix b/lib/modules.nix
index bb4a659e7a7..20207b31d35 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -493,7 +493,7 @@ rec {
       inherit priority content;
     };
 
-  mkOptionDefault = mkOverride 1001; # priority of option defaults
+  mkOptionDefault = mkOverride 1500; # priority of option defaults
   mkDefault = mkOverride 1000; # used in config sections of non-user modules to set a default
   mkForce = mkOverride 50;
   mkVMOverride = mkOverride 10; # used by ‘nixos-rebuild build-vm’