diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
index e17402540c..e5f88ec5f0 100644
--- a/src/boot/efi/util.h
+++ b/src/boot/efi/util.h
@@ -194,3 +194,6 @@ char16_t *get_extra_dir(const EFI_DEVICE_PATH *file_path);
 #else
 #  error "Unexpected byte order in EFI mode?"
 #endif
+
+#define bswap_16(x) __builtin_bswap16(x)
+#define bswap_32(x) __builtin_bswap32(x)