diff --git a/src/common/inc/tglobal.h b/src/common/inc/tglobal.h
index 7290db6ec9..fcdfeafefe 100644
--- a/src/common/inc/tglobal.h
+++ b/src/common/inc/tglobal.h
@@ -59,6 +59,7 @@ extern char     tsLocale[];
 extern char     tsCharset[];            // default encode string
 extern int8_t   tsEnableCoreFile;
 extern int32_t  tsCompressMsgSize;
+extern int32_t  tsMaxNumOfDistinctResults;
 extern char     tsTempDir[];
 
 //query buffer management