diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
index c68e168..27b108a 100644
--- a/arch/h8300/include/asm/Kbuild
+++ b/arch/h8300/include/asm/Kbuild
@@ -1 +1,2 @@
 include include/asm-generic/Kbuild.asm
+unifdef-y += swab.h
diff --git a/arch/h8300/include/asm/byteorder.h b/arch/h8300/include/asm/byteorder.h
index 36e597d..c36b80a 100644
--- a/arch/h8300/include/asm/byteorder.h
+++ b/arch/h8300/include/asm/byteorder.h
@@ -1,13 +1,7 @@
 #ifndef _H8300_BYTEORDER_H
 #define _H8300_BYTEORDER_H
 
-#include <asm/types.h>
-
-#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
-#  define __BYTEORDER_HAS_U64__
-#  define __SWAB_64_THRU_32__
-#endif
-
+#include <asm/swab.h>
 #include <linux/byteorder/big_endian.h>
 
 #endif /* _H8300_BYTEORDER_H */
diff --git a/arch/h8300/include/asm/swab.h b/arch/h8300/include/asm/swab.h
new file mode 100644
index 0000000..c108f39
--- /dev/null
+++ b/arch/h8300/include/asm/swab.h
@@ -0,0 +1,10 @@
+#ifndef _H8300_SWAB_H
+#define _H8300_SWAB_H
+
+#include <asm/types.h>
+
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
+#  define __SWAB_64_THRU_32__
+#endif
+
+#endif /* _H8300_SWAB_H */