diff --git a/lib/ClickHouse_Server.cpp b/lib/ClickHouse_Server.cpp
index 47a4b3b74..e28a36c1c 100644
--- a/lib/ClickHouse_Server.cpp
+++ b/lib/ClickHouse_Server.cpp
@@ -9,6 +9,7 @@
 
 #include "MySQL_Logger.hpp"
 #include "MySQL_Data_Stream.h"
+#include "query_processor.h"
 
 #include <search.h>
 #include <stdlib.h>