diff --git a/src/llvm/ConvertUTF.cpp b/src/llvm/ConvertUTF.cpp
index 8774c471e3..73f66d12f9 100644
--- a/src/llvm/ConvertUTF.cpp
+++ b/src/llvm/ConvertUTF.cpp
@@ -62,8 +62,6 @@ static const UTF32 halfMask = 0x3FFUL;
 #define UNI_SUR_HIGH_END    (UTF32)0xDBFF
 #define UNI_SUR_LOW_START   (UTF32)0xDC00
 #define UNI_SUR_LOW_END     (UTF32)0xDFFF
-#define false      0
-#define true        1
 
 /* --------------------------------------------------------------------- */