diff --git a/pcsx2/CDVD/CsoFileReader.h b/pcsx2/CDVD/CsoFileReader.h
index 04f5c19ab1..dca3ffe890 100644
--- a/pcsx2/CDVD/CsoFileReader.h
+++ b/pcsx2/CDVD/CsoFileReader.h
@@ -37,8 +37,12 @@ class CsoFileReader : public AsyncFileReader
 	DeclareNoncopyableObject(CsoFileReader);
 public:
 	CsoFileReader(void) :
+		m_frameSize(0),
+		m_frameShift(0),
+		m_indexShift(0),
 		m_readBuffer(0),
 		m_zlibBuffer(0),
+		m_zlibBufferFrame(0),
 		m_index(0),
 		m_totalSize(0),
 		m_src(0),
diff --git a/pcsx2/CDVD/GzippedFileReader.cpp b/pcsx2/CDVD/GzippedFileReader.cpp
index 7c2dcc40db..536a59ed40 100644
--- a/pcsx2/CDVD/GzippedFileReader.cpp
+++ b/pcsx2/CDVD/GzippedFileReader.cpp
@@ -178,6 +178,7 @@ static wxString iso2indexname(const wxString& isoname) {
 }
 
 GzippedFileReader::GzippedFileReader(void) :
+	mBytesRead(0),
 	m_pIndex(0),
 	m_zstates(0),
 	m_src(0),
diff --git a/pcsx2/CDVD/IsoFS/IsoFS.cpp b/pcsx2/CDVD/IsoFS/IsoFS.cpp
index 47c4906933..80a215ccd4 100644
--- a/pcsx2/CDVD/IsoFS/IsoFS.cpp
+++ b/pcsx2/CDVD/IsoFS/IsoFS.cpp
@@ -105,6 +105,7 @@ IsoDirectory::IsoDirectory(SectorSource& r)
 IsoDirectory::IsoDirectory(SectorSource& r, IsoFileDescriptor directoryEntry)
 	: internalReader(r)
 {
+	m_fstype = FStype_ISO9660;
 	Init(directoryEntry);
 }