diff --git a/include/tquic.h b/include/tquic.h
index bb3175f9..db41649b 100644
--- a/include/tquic.h
+++ b/include/tquic.h
@@ -491,6 +491,11 @@ struct quic_conn_t *quic_endpoint_get_connection(struct quic_endpoint_t *endpoin
  */
 void quic_endpoint_close(struct quic_endpoint_t *endpoint);
 
+/**
+ * Get index of the connection
+ */
+uint64_t quic_conn_index(struct quic_conn_t *conn);
+
 /**
  * Check whether the connection is a server connection.
  */
diff --git a/src/ffi.rs b/src/ffi.rs
index aec20bea..e66a168e 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -458,6 +458,12 @@ pub extern "C" fn quic_endpoint_close(endpoint: &mut Endpoint) {
     endpoint.close()
 }
 
+/// Get index of the connection
+#[no_mangle]
+pub extern "C" fn quic_conn_index(conn: &mut Connection) -> u64 {
+    conn.index().unwrap_or(u64::MAX)
+}
+
 /// Check whether the connection is a server connection.
 #[no_mangle]
 pub extern "C" fn quic_conn_is_server(conn: &mut Connection) -> bool {