diff --git a/nixos/modules/services/matrix/mjolnir.nix b/nixos/modules/services/matrix/mjolnir.nix
index e20029e2d961..ab6b580b5ef9 100644
--- a/nixos/modules/services/matrix/mjolnir.nix
+++ b/nixos/modules/services/matrix/mjolnir.nix
@@ -30,7 +30,7 @@ let
   moduleConfigFile = pkgs.writeText "module-config.yaml" (
     lib.generators.toYAML { } (
       lib.filterAttrs (_: v: v != null) (
-        lib.fold lib.recursiveUpdate { } [
+        lib.foldr lib.recursiveUpdate { } [
           yamlConfig
           cfg.settings
         ]
diff --git a/pkgs/applications/video/mpv/scripts.nix b/pkgs/applications/video/mpv/scripts.nix
index ab1e5f334d5b..b90501c0e7cf 100644
--- a/pkgs/applications/video/mpv/scripts.nix
+++ b/pkgs/applications/video/mpv/scripts.nix
@@ -6,7 +6,7 @@
 }:
 
 let
-  unionOfDisjoints = lib.fold lib.attrsets.unionOfDisjoint { };
+  unionOfDisjoints = lib.foldr lib.attrsets.unionOfDisjoint { };
 
   addTests =
     attrPath: drv: