diff --git a/src/Core/Types_fwd.h b/src/Core/Types_fwd.h
index a59e4b6eab8..c75d4d627b2 100644
--- a/src/Core/Types_fwd.h
+++ b/src/Core/Types_fwd.h
@@ -28,16 +28,10 @@ namespace DB
 using UUID = StrongTypedef<UInt128, struct UUIDTag>;
 
 struct IPv4;
-
 struct IPv6;
 
 struct Null;
 
-using UInt128 = ::UInt128;
-using UInt256 = ::UInt256;
-using Int128 = ::Int128;
-using Int256 = ::Int256;
-
 enum class TypeIndex;
 
 /// Not a data type in database, defined just for convenience.