diff --git a/YACReaderLibrary/yacreader_local_server.cpp b/YACReaderLibrary/yacreader_local_server.cpp
index 0e55078d..247cb4eb 100644
--- a/YACReaderLibrary/yacreader_local_server.cpp
+++ b/YACReaderLibrary/yacreader_local_server.cpp
@@ -127,10 +127,10 @@ void YACReaderClientConnectionWorker::run()
 	tries = 0;
 	QByteArray data;
     int dataRead = 0;
-	while(data.size() < totalSize && tries < 200)
+    while((quint32)data.size() < totalSize && tries < 200)
 	{
 		data.append(clientConnection->readAll());
-		if(data.length() < totalSize)
+        if((quint32)data.length() < totalSize)
 			clientConnection->waitForReadyRead(100);
         if(dataRead == data.length()) //no bytes were read
             tries++;
diff --git a/compressed_archive/compressed_archive.cpp b/compressed_archive/compressed_archive.cpp
index fe665cca..43412799 100644
--- a/compressed_archive/compressed_archive.cpp
+++ b/compressed_archive/compressed_archive.cpp
@@ -73,12 +73,12 @@ struct SevenZipInterface {
 
 //SevenZipInterface * szInterface;
 
-const char rar[7]={static_cast<char>(0x52), static_cast<char>(0x61), static_cast<char>(0x72), static_cast<char>(0x21), static_cast<char>(0x1A), static_cast<char>(0x07), static_cast<char>(0x00)};
-const char rar5[8]={static_cast<char>(0x52), static_cast<char>(0x61), static_cast<char>(0x72), static_cast<char>(0x21), static_cast<char>(0x1A), static_cast<char>(0x07), static_cast<char>(0x01), static_cast<char>(0x00)};
-const char zip[2]={static_cast<char>(0x50), static_cast<char>(0x4B)};
-const char sevenz[6]={static_cast<char>(0x37), static_cast<char>(0x7A), static_cast<char>(0xBC), static_cast<char>(0xAF), static_cast<char>(0x27), static_cast<char>(0x1C)};
-const char tar[6]="ustar";
-const char arj[2]={static_cast<char>(0x60), static_cast<char>(0xEA)};
+const unsigned char rar[7]={static_cast<unsigned char>(0x52), static_cast<unsigned char>(0x61), static_cast<unsigned char>(0x72), static_cast<unsigned char>(0x21), static_cast<unsigned char>(0x1A), static_cast<unsigned char>(0x07), static_cast<unsigned char>(0x00)};
+const unsigned char rar5[8]={static_cast<unsigned char>(0x52), static_cast<unsigned char>(0x61), static_cast<unsigned char>(0x72), static_cast<unsigned char>(0x21), static_cast<unsigned char>(0x1A), static_cast<unsigned char>(0x07), static_cast<unsigned char>(0x01), static_cast<unsigned char>(0x00)};
+const unsigned char zip[2]={static_cast<unsigned char>(0x50), static_cast<unsigned char>(0x4B)};
+const unsigned char sevenz[6]={static_cast<unsigned char>(0x37), static_cast<unsigned char>(0x7A), static_cast<unsigned char>(0xBC), static_cast<unsigned char>(0xAF), static_cast<unsigned char>(0x27), static_cast<unsigned char>(0x1C)};
+const unsigned char tar[6]="ustar";
+const unsigned char arj[2]={static_cast<unsigned char>(0x60), static_cast<unsigned char>(0xEA)};
 
 CompressedArchive::CompressedArchive(const QString & filePath, QObject *parent) :
     QObject(parent),sevenzLib(0),valid(false),tools(false)
@@ -404,7 +404,7 @@ QVector<quint32> CompressedArchive::translateIndexes(const QVector<quint32> & in
 
     foreach(quint32 i, indexes)
     {
-        if(i < offsets.length())
+        if(i < (quint32)offsets.length())
             translatedIndexes.append(offsets.at(i));
     }