diff --git a/filecoin-proofs/src/api/window_post.rs b/filecoin-proofs/src/api/window_post.rs
index 0efa14a407..0d4c769df5 100644
--- a/filecoin-proofs/src/api/window_post.rs
+++ b/filecoin-proofs/src/api/window_post.rs
@@ -267,7 +267,10 @@ pub fn generate_single_window_post_with_vanilla<Tree: 'static + MerkleTreeTrait>
 
     let vanilla_params = window_post_setup_params(&post_config);
     let partitions = get_partitions_for_window_post(vanilla_proofs.len(), &post_config);
-    ensure!(partition_index < partitions.unwrap_or(1), "Invalid partition index specified");
+    ensure!(
+        partition_index < partitions.unwrap_or(1),
+        "Invalid partition index specified"
+    );
 
     let setup_params = compound_proof::SetupParams {
         vanilla_params,