diff --git a/src/cc/CCinclude.h b/src/cc/CCinclude.h
index ab320e58a..2e447f485 100644
--- a/src/cc/CCinclude.h
+++ b/src/cc/CCinclude.h
@@ -55,9 +55,11 @@ extern std::string CCerror;
 
 #define SMALLVAL 0.000000000000001
 #define MIN_NOTARIZATION_CONFIRMS 2
+#ifndef _BITS256
+#define _BITS256
 union _bits256 { uint8_t bytes[32]; uint16_t ushorts[16]; uint32_t uints[8]; uint64_t ulongs[4]; uint64_t txid; };
 typedef union _bits256 bits256;
-
+#endif
 struct CC_utxo
 {
     uint256 txid;
diff --git a/src/komodo_structs.h b/src/komodo_structs.h
index 3d8f50718..470eeda09 100644
--- a/src/komodo_structs.h
+++ b/src/komodo_structs.h
@@ -47,10 +47,11 @@
 #define KOMODO_KVBINARY 2
 #define KOMODO_KVDURATION 1440
 #define KOMODO_ASSETCHAIN_MAXLEN 65
-
+#ifndef _BITS256
+#define _BITS256
 union _bits256 { uint8_t bytes[32]; uint16_t ushorts[16]; uint32_t uints[8]; uint64_t ulongs[4]; uint64_t txid; };
 typedef union _bits256 bits256;
-
+#endif
 union _bits320 { uint8_t bytes[40]; uint16_t ushorts[20]; uint32_t uints[10]; uint64_t ulongs[5]; uint64_t txid; };
 typedef union _bits320 bits320;