diff --git a/src/net.h b/src/net.h
--- a/src/net.h
+++ b/src/net.h
@@ -532,11 +532,11 @@
     CDataStream hdrbuf;
     // Complete header.
     CMessageHeader hdr;
-    unsigned int nHdrPos;
+    uint32_t nHdrPos;
 
     // Received message data.
     CDataStream vRecv;
-    unsigned int nDataPos;
+    uint32_t nDataPos;
 
     // Time (in microseconds) of message receipt.
     int64_t nTime;
@@ -567,8 +567,8 @@
         vRecv.SetVersion(nVersionIn);
     }
 
-    int readHeader(const Config &config, const char *pch, unsigned int nBytes);
-    int readData(const char *pch, unsigned int nBytes);
+    int readHeader(const Config &config, const char *pch, uint32_t nBytes);
+    int readData(const char *pch, uint32_t nBytes);
 };
 
 /** Information about a peer */
@@ -739,8 +739,8 @@
         return nRefCount;
     }
 
-    bool ReceiveMsgBytes(const Config &config, const char *pch,
-                         unsigned int nBytes, bool &complete);
+    bool ReceiveMsgBytes(const Config &config, const char *pch, uint32_t nBytes,
+                         bool &complete);
 
     void SetRecvVersion(int nVersionIn) { nRecvVersion = nVersionIn; }
     int GetRecvVersion() { return nRecvVersion; }
diff --git a/src/net.cpp b/src/net.cpp
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -708,7 +708,7 @@
 }
 
 bool CNode::ReceiveMsgBytes(const Config &config, const char *pch,
-                            unsigned int nBytes, bool &complete) {
+                            uint32_t nBytes, bool &complete) {
     complete = false;
     int64_t nTimeMicros = GetTimeMicros();
     LOCK(cs_vRecv);
@@ -792,10 +792,10 @@
 }
 
 int CNetMessage::readHeader(const Config &config, const char *pch,
-                            unsigned int nBytes) {
+                            uint32_t nBytes) {
     // copy data to temporary parsing buffer
-    unsigned int nRemaining = 24 - nHdrPos;
-    unsigned int nCopy = std::min(nRemaining, nBytes);
+    uint32_t nRemaining = 24 - nHdrPos;
+    uint32_t nCopy = std::min(nRemaining, nBytes);
 
     memcpy(&hdrbuf[nHdrPos], pch, nCopy);
     nHdrPos += nCopy;
@@ -824,7 +824,7 @@
     return nCopy;
 }
 
-int CNetMessage::readData(const char *pch, unsigned int nBytes) {
+int CNetMessage::readData(const char *pch, uint32_t nBytes) {
     unsigned int nRemaining = hdr.nMessageSize - nDataPos;
     unsigned int nCopy = std::min(nRemaining, nBytes);
 
@@ -1407,7 +1407,7 @@
             if (recvSet || errorSet) {
                 // typical socket buffer is 8K-64K
                 char pchBuf[0x10000];
-                int nBytes = 0;
+                int32_t nBytes = 0;
                 {
                     LOCK(pnode->cs_hSocket);
                     if (pnode->hSocket == INVALID_SOCKET) {