diff --git a/examples/retrieval/knn_index.py b/examples/retrieval/knn_index.py
index 81a5c7a37b..9db4a6d7d4 100644
--- a/examples/retrieval/knn_index.py
+++ b/examples/retrieval/knn_index.py
@@ -43,6 +43,7 @@ def get_index(
         res = faiss.StandardGpuResources()
         # pyre-fixme[16]
         config = faiss.GpuIndexIVFPQConfig()
+        # pyre-ignore[16]
         index = faiss.GpuIndexIVFPQ(
             res,
             embedding_dim,