diff --git a/pw_build/copy_from_cipd.gni b/pw_build/copy_from_cipd.gni
index bb9502b..19d332a 100644
--- a/pw_build/copy_from_cipd.gni
+++ b/pw_build/copy_from_cipd.gni
@@ -75,6 +75,8 @@
     # well.
     inputs = [ invoker.manifest ]
     outputs = [ _out_file ]
+
+    python_deps = [ "$dir_pw_build/py" ]
   }
 
   pw_source_set(target_name) {