diff --git a/sbin/nvmecontrol/nvmecontrol.h b/sbin/nvmecontrol/nvmecontrol.h
--- a/sbin/nvmecontrol/nvmecontrol.h
+++ b/sbin/nvmecontrol/nvmecontrol.h
@@ -103,10 +103,18 @@
 typedef __uint128_t uint128_t;
 #endif
 
+/*
+ * Assumes that the source is in little endian order, but we want the return in
+ * host order.
+ */
 static __inline uint128_t
 to128(void *p)
 {
+#if _BYTE_ORDER == _LITTLE_ENDIAN
 	return *(uint128_t *)p;
+#else
+	return le64toh(*(uint64_t *)p) | ((uint128_t)le64toh(*((uint64_t *)p + 1)) << 64);
+#endif
 }
 
 uint64_t le48dec(const void *pp);