diff --git a/core/fxcrt/bytestring.cpp b/core/fxcrt/bytestring.cpp
index c82bf8b..60b2847 100644
--- a/core/fxcrt/bytestring.cpp
+++ b/core/fxcrt/bytestring.cpp
@@ -66,10 +66,6 @@
 static_assert(sizeof(ByteString) <= sizeof(char*),
               "Strings must not require more space than pointers");
 
-#define FORCE_ANSI 0x10000
-#define FORCE_UNICODE 0x20000
-#define FORCE_INT64 0x40000
-
 // static
 ByteString ByteString::FormatInteger(int i) {
   char buf[32];