diff --git a/service-src/localcast.h b/service-src/localcast.h
new file mode 100644
index 00000000..f66ab0b2
--- /dev/null
+++ b/service-src/localcast.h
@@ -0,0 +1,13 @@
+#ifndef SKYNET_LOCAL_CAST_H
+#define SKYNET_LOCAL_CAST_H
+
+#include <stdint.h>
+
+struct localcast {
+	int n;
+	const uint32_t * group;
+	void *msg;
+	size_t sz;
+};
+
+#endif