diff --git a/dbms/src/Interpreters/ExpressionAnalyzer.cpp b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
index e39790e3eb7..9d86f3c63b4 100644
--- a/dbms/src/Interpreters/ExpressionAnalyzer.cpp
+++ b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
@@ -77,7 +77,7 @@
 namespace DB
 {
 
-using LogAST = DebugASTLog<true>;
+using LogAST = DebugASTLog<false>; /// set to true to enable logs
 
 
 namespace ErrorCodes