diff --git a/modules/dcc.cpp b/modules/dcc.cpp
index 9780d3e3..e20f49a8 100644
--- a/modules/dcc.cpp
+++ b/modules/dcc.cpp
@@ -31,7 +31,7 @@ public:
 	void SendPacket();
 	virtual Csock* GetSockObj(const CString& sHost, unsigned short uPort);
 	CFile* OpenFile(bool bWrite = true);
-	bool Seek(unsigned int uPos);
+	bool Seek(unsigned long int uPos);
 
 	// Setters
 	void SetRemoteIP(const CString& s) { m_sRemoteIP = s; }
@@ -58,8 +58,8 @@ protected:
 	CString         m_sLocalFile;
 	CString         m_sSendBuf;
 	unsigned short  m_uRemotePort;
-	unsigned long   m_uFileSize;
-	unsigned long   m_uBytesSoFar;
+	unsigned long long  m_uFileSize;
+	unsigned long long  m_uBytesSoFar;
 	bool            m_bSend;
 	bool            m_bNoDelFile;
 	CFile*          m_pFile;
@@ -309,7 +309,7 @@ void CDCCSock::ReadData(const char* data, size_t len) {
 	} else {
 		m_pFile->Write(data, len);
 		m_uBytesSoFar += len;
-		uint32_t uSoFar = htonl(m_uBytesSoFar);
+		uint32_t uSoFar = htonl((uint32_t)m_uBytesSoFar);
 		Write((char*) &uSoFar, sizeof(uSoFar));
 
 		if (m_uBytesSoFar >= m_uFileSize) {
@@ -447,14 +447,14 @@ CFile* CDCCSock::OpenFile(bool bWrite) {
 		// The DCC specs only allow file transfers with files smaller
 		// than 4GiB (see ReadData()).
 		unsigned long long uFileSize = m_pFile->GetSize();
-		if (uFileSize > (unsigned long long) 0xffffffff) {
+		if (uFileSize > (unsigned long long) 0xffffffffULL) {
 			delete m_pFile;
 			m_pFile = NULL;
 			m_pModule->PutModule("DCC -> [" + m_sRemoteNick + "] - File too large (>4 GiB) [" + m_sLocalFile + "]");
 			return NULL;
 		}
 
-		m_uFileSize = (unsigned long) uFileSize;
+		m_uFileSize = uFileSize;
 	}
 
 	m_sFileName = m_pFile->GetShortName();
@@ -462,7 +462,7 @@ CFile* CDCCSock::OpenFile(bool bWrite) {
 	return m_pFile;
 }
 
-bool CDCCSock::Seek(unsigned int uPos) {
+bool CDCCSock::Seek(unsigned long int uPos) {
 	if (m_pFile) {
 		if (m_pFile->Seek(uPos)) {
 			m_uBytesSoFar = uPos;
diff --git a/modules/q.cpp b/modules/q.cpp
index 6a7e39e7..ac6a228a 100644
--- a/modules/q.cpp
+++ b/modules/q.cpp
@@ -443,7 +443,7 @@ private:
 		CString sOuterKey, sInnerKey;
 		CString::size_type iKeyLength = sRealKey.length();
 		for (unsigned int i = 0; i < 64; i++) {
-			int r = (i < iKeyLength ? sRealKey[i] : 0);
+			char r = (i < iKeyLength ? sRealKey[i] : '\0');
 			sOuterKey += r ^ 0x5c;
 			sInnerKey += r ^ 0x36;
 		}
diff --git a/modules/sasl.cpp b/modules/sasl.cpp
index 890374c3..8eb5f665 100644
--- a/modules/sasl.cpp
+++ b/modules/sasl.cpp
@@ -222,8 +222,7 @@ public:
 		}
 
 		/* Prime number */
-		unsigned int size = ntohs((((unsigned int)data[1]) << 8) | data[0]);
-		size = ntohs(*(unsigned int*)data);
+		unsigned int size = ntohs(*(uint16_t*)data);
 		data += 2;
 		length -= 2;
 
@@ -243,8 +242,7 @@ public:
 			return false;
 		}
 
-		size = ntohs((((unsigned int)data[1]) << 8) | data[0]);
-		size = ntohs(*(unsigned int*)data);
+		size = ntohs(*(uint16_t*)data);
 		data += 2;
 		length -= 2;
 
@@ -258,8 +256,7 @@ public:
 		data += size;
 
 		/* Server public key */
-		size = ntohs((((unsigned int)data[1]) << 8) | data[0]);
-		size = ntohs(*(unsigned int*)data);
+		size = ntohs(*(uint16_t*)data);
 		data += 2;
 		length -= 2;
 
@@ -289,6 +286,7 @@ public:
 		}
 
 		/* Encrypt our sasl password with blowfish */
+		// TODO for passwords with length 8, 16, 24, 32, etc. this will have 8 additional zero bytes at the end... But it works when treated as null-terminated string anyway, and if it works I don't want to touch it right now.
 		CString::size_type password_length = GetNV("password").size() + (8 - (GetNV("password").size() % 8));
 		unsigned char *encrypted_password = (unsigned char *)malloc(password_length);
 		char *plaintext_password = (char *)malloc(password_length);
@@ -315,7 +313,7 @@ public:
 		out_ptr = response;
 
 		/* Add our key to the response */
-		*((unsigned int *)out_ptr) = htons(BN_num_bytes(dh->pub_key));
+		*((uint16_t *)out_ptr) = htons((uint16_t)BN_num_bytes(dh->pub_key));
 		out_ptr += 2;
 		BN_bn2bin(dh->pub_key, (unsigned char *)out_ptr);
 		out_ptr += BN_num_bytes(dh->pub_key);
diff --git a/src/FileUtils.cpp b/src/FileUtils.cpp
index e15bd116..1aba0c99 100644
--- a/src/FileUtils.cpp
+++ b/src/FileUtils.cpp
@@ -412,7 +412,7 @@ ssize_t CFile::Write(const char *pszBuffer, size_t iBytes) {
 	}
 
 	ssize_t res = write(m_iFD, pszBuffer, iBytes);
-	if (res != iBytes)
+	if (-1 == res)
 		m_bHadError = true;
 	return res;
 }
diff --git a/src/main.cpp b/src/main.cpp
index dcff4852..10491efb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -108,7 +108,7 @@ static void seedPRNG() {
 
 		// This is in [0:1e6], which means that roughly 20 bits are
 		// actually used, let's try to shuffle the high bits.
-		seed ^= (tv.tv_usec << 10) | tv.tv_usec;
+		seed ^= uint32_t((tv.tv_usec << 10) | tv.tv_usec);
 	} else
 		seed = (unsigned int)time(NULL);
 
diff --git a/src/znc.cpp b/src/znc.cpp
index e3fcefe8..a3ea2fbc 100644
--- a/src/znc.cpp
+++ b/src/znc.cpp
@@ -582,7 +582,7 @@ bool CZNC::WriteNewConfig(const CString& sConfigFile) {
 		CUtils::GetInput("Listen Host", sListenHost, sListenHost, "Blank for all ips");
 
 		CUtils::PrintAction("Verifying the listener");
-		CListener* pListener = new CListener(uListenPort, sListenHost, bListenSSL,
+		CListener* pListener = new CListener((unsigned short int)uListenPort, sListenHost, bListenSSL,
 				b6 ? ADDR_ALL : ADDR_IPV4ONLY, CListener::ACCEPT_ALL);
 		if (!pListener->Listen()) {
 			CUtils::PrintStatus(false, FormatBindError());