diff --git a/HTTPSock.cpp b/HTTPSock.cpp
index a74f7417..6bdac592 100644
--- a/HTTPSock.cpp
+++ b/HTTPSock.cpp
@@ -372,7 +372,7 @@ bool CHTTPSock::SentHeader() const {
 	return m_bSentHeader;
 }
 
-bool CHTTPSock::PrintHeader(unsigned long uContentLength, const CString& sContentType, unsigned int uStatusId, const CString& sStatusMsg) {
+bool CHTTPSock::PrintHeader(off_t uContentLength, const CString& sContentType, unsigned int uStatusId, const CString& sStatusMsg) {
 	if (SentHeader()) {
 		DEBUG("- Header already sent!");
 		return false;
diff --git a/HTTPSock.h b/HTTPSock.h
index b3554142..d89a9814 100644
--- a/HTTPSock.h
+++ b/HTTPSock.h
@@ -37,7 +37,7 @@ public:
 
 	void CheckPost();
 	bool SentHeader() const;
-	bool PrintHeader(unsigned long uContentLength, const CString& sContentType = "", unsigned int uStatusId = 200, const CString& sStatusMsg = "OK");
+	bool PrintHeader(off_t uContentLength, const CString& sContentType = "", unsigned int uStatusId = 200, const CString& sStatusMsg = "OK");
 	void AddHeader(const CString& sName, const CString& sValue);
 	void SetContentType(const CString& sContentType);