diff --git a/lib/libnx/include/nx/macro.h b/lib/libnx/include/nx/macro.h
index 9ad295c..65a30be 100644
--- a/lib/libnx/include/nx/macro.h
+++ b/lib/libnx/include/nx/macro.h
@@ -1,3 +1,4 @@
 #pragma once
 
 #define _MAKE_STRUCT_SIGNATURE(x) ((uint32_t)(x[3]) << 24 | (uint32_t)(x[2]) << 16 | (uint32_t)(x[1]) << 8 | (uint32_t)(x[0]))
+#define _MAKE_STRUCT_SIGNATURE_U64(x) ((uint64_t)(x[7]) << 56 | (uint64_t)(x[6]) << 48 | (uint64_t)(x[5]) << 40 | (uint64_t)(x[4]) << 32 | (uint64_t)(x[3]) << 24 | (uint64_t)(x[2]) << 16 | (uint64_t)(x[1]) << 8 | (uint64_t)(x[0]))