diff --git a/src/app/chip_data_model.gni b/src/app/chip_data_model.gni
index ff42f7c1b195ee..300a60006cea1c 100644
--- a/src/app/chip_data_model.gni
+++ b/src/app/chip_data_model.gni
@@ -190,6 +190,7 @@ template("chip_data_model") {
     }
 
     _custom_impl_clusters = []
+    not_needed([ "_custom_impl_clusters" ])  # Might not be needed.
     if (defined(invoker.zap_clusters_with_custom_implementation)) {
       _custom_impl_clusters = invoker.zap_clusters_with_custom_implementation
     }