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-rw-r--r--nixos/doc/manual/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/doc/manual/default.nix b/nixos/doc/manual/default.nix
index 9bc83be66104..8079a2feb29f 100644
--- a/nixos/doc/manual/default.nix
+++ b/nixos/doc/manual/default.nix
@@ -12,7 +12,7 @@ let
   substFunction = x:
     if builtins.isAttrs x then lib.mapAttrs (name: substFunction) x
     else if builtins.isList x then map substFunction x
-    else if builtins.isFunction x then "<function>"
+    else if lib.isFunction x then "<function>"
     else x;
 
   # Clean up declaration sites to not refer to the NixOS source tree.