diff --git a/src/decode.h b/src/decode.h
index 09a1c55..d8c454a 100644
--- a/src/decode.h
+++ b/src/decode.h
@@ -1,7 +1,6 @@
 #include "global.h"
 #include "a64instruction.h"
 
-#define WORD_BITS 32
 #define HALT_WORD 0x8a000000
 
 #define TYPE_ID_LSB 26