diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index abb08dfb98c..0f9223f6da5 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -230,6 +230,8 @@ let
         isBuildPythonPackage = platforms;
         schedulingPriority = str;
         downloadURLRegexp = str;
+        isFcitxEngine = bool;
+        isIbusEngine = bool;
       };
 
       checkMetaAttr = k: v: