diff --git a/lib/default.nix b/lib/default.nix
index ccfee2ebe303..8e29ef5c4201 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -116,7 +116,7 @@ let
       pushDownProperties dischargeProperties filterOverrides
       sortProperties fixupOptionType mkIf mkAssert mkMerge mkOverride
       mkOptionDefault mkDefault mkForce mkVMOverride
-      mkOrder mkBefore mkAfter mkAliasDefinitions
+      mkFixStrictness mkOrder mkBefore mkAfter mkAliasDefinitions
       mkAliasAndWrapDefinitions fixMergeModules mkRemovedOptionModule
       mkRenamedOptionModule mkMergedOptionModule mkChangedOptionModule
       mkAliasOptionModule doRename;
diff --git a/lib/modules.nix b/lib/modules.nix
index 58c6cda58e49..ab2bc4f7f8e2 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -713,6 +713,8 @@ rec {
   mkForce = mkOverride 50;
   mkVMOverride = mkOverride 10; # used by ‘nixos-rebuild build-vm’
 
+  mkFixStrictness = lib.warn "lib.mkFixStrictness has no effect and will be removed. It returns its argument unmodified, so you can just remove any calls." id;
+
   mkOrder = priority: content:
     { _type = "order";
       inherit priority content;