diff --git a/pcsx2/AsyncFileReader.h b/pcsx2/AsyncFileReader.h
index b83b9e53e0..73f5a5e572 100644
--- a/pcsx2/AsyncFileReader.h
+++ b/pcsx2/AsyncFileReader.h
@@ -25,11 +25,11 @@
 class AsyncFileReader
 {
 protected:
-	AsyncFileReader(void) {m_dataoffset=0;}
+	AsyncFileReader() : m_dataoffset(0) {}
 
 	wxString m_filename;
 
-	uint m_dataoffset;
+	int m_dataoffset;
 	uint m_blocksize;
 
 public:
@@ -48,7 +48,7 @@ public:
 	virtual uint GetBlockCount(void) const=0;
 
 	virtual void SetBlockSize(uint bytes) {}
-	virtual void SetDataOffset(uint bytes) {}
+	virtual void SetDataOffset(int bytes) {}
 
 	uint GetBlockSize() const { return m_blocksize; }
 
@@ -92,7 +92,7 @@ public:
 	virtual uint GetBlockCount(void) const;
 
 	virtual void SetBlockSize(uint bytes) { m_blocksize = bytes; }
-	virtual void SetDataOffset(uint bytes) { m_dataoffset = bytes; }
+	virtual void SetDataOffset(int bytes) { m_dataoffset = bytes; }
 };
 
 // Factory - creates an AsyncFileReader derived instance which can read a compressed file
diff --git a/pcsx2/CDVD/CompressedFileReader.cpp b/pcsx2/CDVD/CompressedFileReader.cpp
index 8b15deae1e..53fd086d02 100644
--- a/pcsx2/CDVD/CompressedFileReader.cpp
+++ b/pcsx2/CDVD/CompressedFileReader.cpp
@@ -225,7 +225,7 @@ public:
 	};
 
 	virtual void SetBlockSize(uint bytes) { m_blocksize = bytes; }
-	virtual void SetDataOffset(uint bytes) { m_dataoffset = bytes; }
+	virtual void SetDataOffset(int bytes) { m_dataoffset = bytes; }
 private:
 	class Czstate {
 	public:
diff --git a/pcsx2/Linux/LnxFlatFileReader.cpp b/pcsx2/Linux/LnxFlatFileReader.cpp
index eaf1aa4563..b19fd25863 100644
--- a/pcsx2/Linux/LnxFlatFileReader.cpp
+++ b/pcsx2/Linux/LnxFlatFileReader.cpp
@@ -49,7 +49,7 @@ int FlatFileReader::ReadSync(void* pBuffer, uint sector, uint count)
 void FlatFileReader::BeginRead(void* pBuffer, uint sector, uint count)
 {
 	u64 offset;
-	offset = sector * (u64)m_blocksize + m_dataoffset;
+	offset = sector * (s64)m_blocksize + m_dataoffset;
 
 	u32 bytesToRead = count * m_blocksize;