diff --git a/libubus.c b/libubus.c
index 260e40f..846ae83 100644
--- a/libubus.c
+++ b/libubus.c
@@ -283,7 +283,7 @@ int ubus_connect_ctx(struct ubus_context *ctx, const char *path)
 	ctx->connection_lost = ubus_default_connection_lost;
 	ctx->pending_timer.cb = ubus_process_pending_msg;
 
-	ctx->msgbuf.data = calloc(UBUS_MSG_CHUNK_SIZE, sizeof(char));
+	ctx->msgbuf.data = calloc(1, UBUS_MSG_CHUNK_SIZE);
 	if (!ctx->msgbuf.data)
 		return -1;
 	ctx->msgbuf_data_len = UBUS_MSG_CHUNK_SIZE;