diff --git a/include/usb/usb.h b/include/usb/usb.h
index 4649ee2..afccf70 100644
--- a/include/usb/usb.h
+++ b/include/usb/usb.h
@@ -270,7 +270,7 @@
 #ifdef __LITTLE_ENDIAN
 # define swap_16(x) (x)
 # define swap_32(x) (x)
-#elif defined BIG_ENDIAN
+#elif defined __BIG_ENDIAN
 # define swap_16(x) __swap_16(x)
 # define swap_32(x) __swap_32(x)
 #else