diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index c8c5ef671..0ebadf7e3 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -5,7 +5,7 @@
 	(EDI_REG_NUM): New macros.
 	(MODRM_MOD_FIELD,MODRM_REG_FIELD,MODRM_RM_FIELD): New macros.
 	(SIB_SCALE_FIELD,SIB_INDEX_FIELD,SIB_BASE_FIELD): New macros.
-	(REG_PREFIX_P): New macro.
+	(REX_PREFIX_P): New macro.
 
 2009-01-09  Peter Bergner  <bergner@vnet.ibm.com>