diff --git a/dbms/src/Functions/currentUser.cpp b/dbms/src/Functions/currentUser.cpp
index ee7c4d589a0..fa8b3103be2 100644
--- a/dbms/src/Functions/currentUser.cpp
+++ b/dbms/src/Functions/currentUser.cpp
@@ -48,7 +48,7 @@ public:
 void registerFunctionCurrentUser(FunctionFactory & factory)
 {
     factory.registerFunction<FunctionCurrentUser>();
-    factory.registerAlias("user", FunctionCurrentUser::name, FunctionFactory::CaseSensitive);
+    factory.registerAlias("user", FunctionCurrentUser::name, FunctionFactory::CaseInsensitive);
 }
 
 }