diff --git a/nix/plugin.nix b/nix/plugin.nix
index 762c385..c9ca355 100644
--- a/nix/plugin.nix
+++ b/nix/plugin.nix
@@ -25,9 +25,11 @@ let
       [ -f "$src" ] && ln -sf "$src" "$out/libexec/$tool"
     done
   '';
+  # Note: nixpkgs qt6 puts headers in the regular output, not .dev (which only
+  # has mkspecs). Use qt6.qtbase / qt6.qtdeclarative directly.
   qtIncludeRoots = runCommand "qt6-include-roots" { } ''
     mkdir -p $out/include
-    for src in ${qt6.qtbase.dev}/include/* ${qt6.qtdeclarative.dev}/include/*; do
+    for src in ${qt6.qtbase}/include/* ${qt6.qtdeclarative}/include/*; do
       ln -sfn "$src" "$out/include/$(basename "$src")"
     done
   '';