diff --git a/crates/net/p2p/src/lib.rs b/crates/net/p2p/src/lib.rs
index 7524499..b83196f 100644
--- a/crates/net/p2p/src/lib.rs
+++ b/crates/net/p2p/src/lib.rs
@@ -506,7 +506,7 @@ fn compute_message_id(message: &libp2p::gossipsub::Message) -> libp2p::gossipsub
         Err(_) => (MESSAGE_DOMAIN_INVALID_SNAPPY, &message.data),
     };
     let topic = message.topic.as_str().as_bytes();
-    let topic_len = (topic.len() as u64).to_be_bytes();
+    let topic_len = (topic.len() as u64).to_le_bytes();
     hasher.update(domain);
     hasher.update(topic_len);
     hasher.update(topic);