diff --git a/src/version.h b/src/version.h
--- a/src/version.h
+++ b/src/version.h
@@ -8,33 +8,33 @@
 /**
  * network protocol versioning
  */
-static const int PROTOCOL_VERSION = 70015;
+static const int32_t PROTOCOL_VERSION = 70015;
 
 //! initial proto version, to be increased after version/verack negotiation
-static const int INIT_PROTO_VERSION = 209;
+static const int32_t INIT_PROTO_VERSION = 209;
 
 //! disconnect from peers older than this proto version
-static const int MIN_PEER_PROTO_VERSION = 31800;
+static const int32_t MIN_PEER_PROTO_VERSION = 31800;
 
 //! BIP 0031, pong message, is enabled for all versions AFTER this one
-static const int BIP0031_VERSION = 60000;
+static const int32_t BIP0031_VERSION = 60000;
 
 //! "filter*" commands are disabled without NODE_BLOOM after and including this
 //! version
-static const int NO_BLOOM_VERSION = 70011;
+static const int32_t NO_BLOOM_VERSION = 70011;
 
 //! "sendheaders" command and announcing blocks with headers starts with this
 //! version
-static const int SENDHEADERS_VERSION = 70012;
+static const int32_t SENDHEADERS_VERSION = 70012;
 
 //! "feefilter" tells peers to filter invs to you by fee starts with this
 //! version
-static const int FEEFILTER_VERSION = 70013;
+static const int32_t FEEFILTER_VERSION = 70013;
 
 //! short-id-based block download starts with this version
-static const int SHORT_IDS_BLOCKS_VERSION = 70014;
+static const int32_t SHORT_IDS_BLOCKS_VERSION = 70014;
 
 //! not banning for invalid compact blocks starts with this version
-static const int INVALID_CB_NO_BAN_VERSION = 70015;
+static const int32_t INVALID_CB_NO_BAN_VERSION = 70015;
 
 #endif // BITCOIN_VERSION_H