diff --git a/sync/src/api.rs b/sync/src/api.rs
index 391eef56f..56a65c755 100644
--- a/sync/src/api.rs
+++ b/sync/src/api.rs
@@ -169,7 +169,18 @@ pub struct AttachedProtocol {
 }
 
 impl AttachedProtocol {
-	fn register(&self, _network: &NetworkService) {}
+	fn register(&self, network: &NetworkService) {
+		let res = network.register_protocol(
+			self.handler.clone(),
+			self.protocol_id,
+			self.packet_count,
+			self.versions
+		);
+
+		if let Err(e) = res {
+			warn!(target: "sync", "Error attaching protocol {:?}: {:?}", self.protocol_id, e);
+		}
+	}
 }
 
 /// EthSync initialization parameters.