diff --git a/src/common/protocol.h b/src/common/protocol.h
--- a/src/common/protocol.h
+++ b/src/common/protocol.h
@@ -190,13 +190,16 @@ struct distren_request
   uint32_t /* enum distren_request_type */ type;
 };
 
+#define DISTREN_REQUEST_VERSION_PACKAGE_STRING_LEN (32)
 /**
  * A DISTREN_REQUEST_VERSION is started with a bitmask specification
  * of the DISTREN_SERVERTYPE_* values.
  */
 struct distren_request_version
 {
-
+  uint32_t servertype;
+  /* + 1 is for terminating NULL */
+  char package_string[DISTREN_REQUEST_VERSION_PACKAGE_STRING_LEN + 1];
 };
 
 /**