diff --git a/DCCBounce.cpp b/DCCBounce.cpp
index 2a8c1e8d..f01dabcd 100644
--- a/DCCBounce.cpp
+++ b/DCCBounce.cpp
@@ -85,7 +85,7 @@ void CDCCBounce::ReachedMaxBuffer() {
 	Close();
 }
 
-void CDCCBounce::ReadData(const char* data, int len) {
+void CDCCBounce::ReadData(const char* data, size_t len) {
 	size_t BufLen;
 
 	if (m_pPeer) {
diff --git a/DCCBounce.h b/DCCBounce.h
index 4c94b4e9..cb887f9d 100644
--- a/DCCBounce.h
+++ b/DCCBounce.h
@@ -26,7 +26,7 @@ public:
 	static unsigned short DCCRequest(const CString& sNick, unsigned long uLongIP, unsigned short uPort, const CString& sFileName, bool bIsChat, CUser* pUser, const CString& sRemoteIP);
 
 	void ReadLine(const CString& sData);
-	virtual void ReadData(const char* data, int len);
+	virtual void ReadData(const char* data, size_t len);
 	virtual void ReadPaused();
 	virtual void Timeout();
 	virtual void ConnectionRefused();
diff --git a/DCCSock.cpp b/DCCSock.cpp
index 668ca4c7..4489b2a4 100644
--- a/DCCSock.cpp
+++ b/DCCSock.cpp
@@ -55,7 +55,7 @@ CDCCSock::~CDCCSock() {
 	m_pUser->DelDCCSock(this);
 }
 
-void CDCCSock::ReadData(const char* data, int len) {
+void CDCCSock::ReadData(const char* data, size_t len) {
 	if (!m_pFile) {
 		DEBUG("File not open! closing get.");
 		m_pUser->PutModule(m_sModuleName, ((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - File not open!");
diff --git a/DCCSock.h b/DCCSock.h
index c216ac2f..621482cd 100644
--- a/DCCSock.h
+++ b/DCCSock.h
@@ -21,7 +21,7 @@ public:
 	CDCCSock(CUser* pUser, const CString& sRemoteNick, const CString& sRemoteIP, unsigned short uRemotePort, const CString& sLocalFile, unsigned long uFileSize, const CString& sModuleName);
 	virtual ~CDCCSock();
 
-	virtual void ReadData(const char* data, int len);
+	virtual void ReadData(const char* data, size_t len);
 	virtual void ConnectionRefused();
 	virtual void SockError(int iErrno);
 	virtual void Timeout();
diff --git a/HTTPSock.cpp b/HTTPSock.cpp
index c5d7a0bd..e9ee2d10 100644
--- a/HTTPSock.cpp
+++ b/HTTPSock.cpp
@@ -36,7 +36,7 @@ void CHTTPSock::Init() {
 
 CHTTPSock::~CHTTPSock() {}
 
-void CHTTPSock::ReadData(const char* data, int len) {
+void CHTTPSock::ReadData(const char* data, size_t len) {
 	if (!m_bDone && m_bGotHeader && m_bPost) {
 		m_sPostData.append(data, len);
 		CheckPost();
diff --git a/HTTPSock.h b/HTTPSock.h
index 26fe25ac..b70fc7cd 100644
--- a/HTTPSock.h
+++ b/HTTPSock.h
@@ -20,7 +20,7 @@ public:
 	virtual ~CHTTPSock();
 
 	// Csocket derived members
-	virtual void ReadData(const char* data, int len);
+	virtual void ReadData(const char* data, size_t len);
 	virtual void ReadLine(const CString& sData);
 	virtual void ReachedMaxBuffer();
 	virtual void SockError(int iErrno);
diff --git a/modules/modperl.cpp b/modules/modperl.cpp
index dcec07e0..43c4751e 100644
--- a/modules/modperl.cpp
+++ b/modules/modperl.cpp
@@ -157,7 +157,7 @@ public:
 // # OnDisconnect($sockhandle)
 	virtual void Disconnected();
 // # OnData($sockhandle, $bytes, $length)
-	virtual void ReadData(const char *data, int len);
+	virtual void ReadData(const char *data, size_t len);
 // # OnReadLine($sockhandle, $line)
 	virtual void ReadLine(const CS_STRING & sLine);
 
@@ -1196,7 +1196,7 @@ void CPerlSock::Disconnected()
 	SOCKCB("OnDisconnect");
 }
 // # OnData($sockhandle, $bytes, $length)
-void CPerlSock::ReadData(const char *data, int len)
+void CPerlSock::ReadData(const char *data, size_t len)
 {
 	SetupArgs();
 	PString sData;