diff --git a/arch/common/common-defs.h b/arch/common/common-defs.h
index 9ac11dc..3e27ca0 100644
--- a/arch/common/common-defs.h
+++ b/arch/common/common-defs.h
@@ -33,6 +33,6 @@ __proc:							\
 	.weak	__alias;				\
 	__alias = __real;
 
-#define REG_OFFSET(__reg)       (MCONTEXT_GREGS + ((__reg) * SZ_REG))
+#define REG_OFFSET(__reg)       (MCONTEXT_GREGS + ((__reg) * REG_SZ))
 
 #endif
diff --git a/arch/x86_64/defs.h b/arch/x86_64/defs.h
index dbbc1d6..9bcc6fd 100644
--- a/arch/x86_64/defs.h
+++ b/arch/x86_64/defs.h
@@ -29,7 +29,7 @@
 
 #define MCONTEXT_GREGS	(40)
 
-#define SZ_REG		(8)
+#define REG_SZ		(8)
 
 #include "common-defs.h"