diff --git a/nix/plugin.nix b/nix/plugin.nix
index 0dd39e6..7c7eb0e 100644
--- a/nix/plugin.nix
+++ b/nix/plugin.nix
@@ -37,10 +37,20 @@ let
   # Args shared between the deps-only build (cached on Cargo.lock changes only)
   # and the final crate build. cxx-qt-build runs during the deps build too, so it
   # needs the Qt env to find qmltyperegistrar/qmlcachegen.
+  # Default cleanCargoSource only keeps .rs/.toml/.lock; we also need
+  # qt_plugin_exports.txt (linker --dynamic-list file referenced by build.rs).
+  pluginSrc = lib.cleanSourceWith {
+    src = ../plugin;
+    name = "nova-plugin-source";
+    filter =
+      path: type:
+      (builtins.match ".*\\.txt$" path != null) || (craneLib.filterCargoSources path type);
+  };
+
   commonArgs = {
     pname = "nova-plugin";
     version = "0.1.0";
-    src = craneLib.cleanCargoSource ../plugin;
+    src = pluginSrc;
     strictDeps = true;
 
     nativeBuildInputs = [