diff --git a/pkgs/lib/options.nix b/pkgs/lib/options.nix
index cde0b6df34c..6a4d6b4b695 100644
--- a/pkgs/lib/options.nix
+++ b/pkgs/lib/options.nix
@@ -482,12 +482,12 @@ rec {
           # evaluate the condition.
           if isThenElse p then
             if condition then
-              foldProperty (a: p.thenPart) id content
+              copyProperties content p.thenPart
             else
-              foldProperty (a: p.elsePart) id content
+              copyProperties content p.elsePart
           # ignore the condition.
           else if isAlways p then
-            foldProperty (a: p.value) id content
+            copyProperties content p.value
           # otherwise (isIf)
           else
             evalIf content (condition && p.condition) (tail list);