diff --git a/deps/oblib/src/lib/ob_define.h b/deps/oblib/src/lib/ob_define.h
index 28ca13a04..c0e5b6d86 100644
--- a/deps/oblib/src/lib/ob_define.h
+++ b/deps/oblib/src/lib/ob_define.h
@@ -142,7 +142,7 @@ const int64_t MAX_LLC_BITMAP_LENGTH = 4096;
 const int64_t MAX_CLUSTER_EVENT_NAME_LENGTH = 256;
 const int64_t MAX_CLUSTER_EVENT_VALUE_LENGTH = 4096;
 const int64_t MAX_ROOTSERVICE_EVENT_NAME_LENGTH = 256;
-const int64_t MAX_ROOTSERVICE_EVENT_VALUE_LENGTH = 256;
+const int64_t MAX_ROOTSERVICE_EVENT_VALUE_LENGTH = 512;
 const int64_t MAX_ROOTSERVICE_EVENT_DESC_LENGTH = 64;
 const int64_t MAX_ROOTSERVICE_EVENT_EXTRA_INFO_LENGTH = 512;
 const int64_t MAX_TENANT_EVENT_NAME_LENGTH = 256;