diff --git a/include/openthread.h b/include/openthread.h
index b285e28c5..d2ec91682 100644
--- a/include/openthread.h
+++ b/include/openthread.h
@@ -945,11 +945,6 @@ ThreadError otIp6AddressFromString(const char *aString, otIp6Address *aAddress);
  *
  */
 
-/**
- * This type points to an OpenThread message buffer.
- */
-typedef void *otMessage;
-
 /**
  * Free an allocated message buffer.
  *