diff --git a/src/crypto/CryptoNight_monero.h b/src/crypto/CryptoNight_monero.h
index 3fb18d00..0ceb93fe 100644
--- a/src/crypto/CryptoNight_monero.h
+++ b/src/crypto/CryptoNight_monero.h
@@ -6,6 +6,7 @@
  * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
  * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
  * Copyright 2018      Lee Clagett <https://github.com/vtnerd>
+ * Copyright 2018      SChernykh   <https://github.com/SChernykh>
  * Copyright 2016-2018 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
  *
  *   This program is free software: you can redistribute it and/or modify
@@ -22,9 +23,10 @@
  *   along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef __CRYPTONIGHT_MONERO_H__
-#define __CRYPTONIGHT_MONERO_H__
+#ifndef XMRIG_CRYPTONIGHT_MONERO_H
+#define XMRIG_CRYPTONIGHT_MONERO_H
 
+#include <fenv.h>
 #include <math.h>
 
 // VARIANT ALTERATIONS
@@ -121,4 +123,4 @@
         vst1q_u64((uint64_t*)((base_ptr) + ((offset) ^ 0x30)), vaddq_u64(chunk2, vreinterpretq_u64_u8(_a))); \
     } while (0)
 #endif
-#endif /* __CRYPTONIGHT_MONERO_H__ */
+#endif /* XMRIG_CRYPTONIGHT_MONERO_H */