diff --git a/kioslave/iso/kiso.cpp b/kioslave/iso/kiso.cpp
index 1b052f6ab..4acb328aa 100644
--- a/kioslave/iso/kiso.cpp
+++ b/kioslave/iso/kiso.cpp
@@ -188,7 +188,7 @@ KIso::~KIso()
 }
 
 /* callback function for libisofs */
-static int readf(char *buf, int start, int len,void *udata) {
+static int readf(char *buf, long start, long len,void *udata) {
 
     TQIODevice* dev = ( static_cast<KIso*> (udata) )->device();
 
@@ -212,7 +212,7 @@ static int mycallb(struct iso_directory_record *idr,void *udata) {
     bool special=false;
     KArchiveEntry *entry=NULL,*oldentry=NULL;
     char z_algo[2],z_params[2];
-    int z_size=0;
+    long long z_size=0;
 
     if ((idr->flags[0] & 1) && !iso->showhidden) return 0;
     if (iso->level) {
@@ -289,7 +289,8 @@ static int mycallb(struct iso_directory_record *idr,void *udata) {
 
 void KIso::addBoot(struct el_torito_boot_descriptor* bootdesc) {
 
-    int i,size;
+    int i;
+    long long size;
     boot_head boot;
     boot_entry *be;
     TQString path;
diff --git a/kioslave/iso/kisofile.cpp b/kioslave/iso/kisofile.cpp
index afac16b74..ffae0d3bc 100644
--- a/kioslave/iso/kisofile.cpp
+++ b/kioslave/iso/kisofile.cpp
@@ -20,7 +20,7 @@
 
 KIsoFile::KIsoFile( KArchive* archive, const TQString& name, int access,
     int date, int adate,int cdate, const TQString& user, const TQString& group,
-    const TQString& symlink,int pos, int size) :
+    const TQString& symlink,long long pos, long long size) :
         KArchiveFile(archive, name, access, date, user, group, symlink, pos, size) {
 
 
@@ -32,7 +32,7 @@ KIsoFile::KIsoFile( KArchive* archive, const TQString& name, int access,
 KIsoFile::~KIsoFile(){
 }
 
-void KIsoFile::setZF(char algo[2],char parms[2],int realsize) {
+void KIsoFile::setZF(char algo[2],char parms[2],long long realsize) {
     m_algo[0]=algo[0];m_algo[1]=algo[1];
     m_parms[0]=parms[0];m_parms[1]=parms[1];
     m_realsize=realsize;
diff --git a/kioslave/iso/kisofile.h b/kioslave/iso/kisofile.h
index 193509cf6..696a8c191 100644
--- a/kioslave/iso/kisofile.h
+++ b/kioslave/iso/kisofile.h
@@ -29,9 +29,9 @@ class KIsoFile : public KArchiveFile  {
 public: 
     KIsoFile( KArchive* archive, const TQString& name, int access, int date,
                     int adate,int cdate, const TQString& user, const TQString& group,
-                   const TQString& symlink, int pos, int size);
+                   const TQString& symlink, long long pos, long long size);
     ~KIsoFile();
-    void setZF(char algo[2],char parms[2],int realsize);
+    void setZF(char algo[2],char parms[2],long long realsize);
     int adate() const { return m_adate; }
     int cdate() const { return m_cdate; }
     long long realsize() const { return m_realsize; }
diff --git a/kioslave/iso/libisofs/isofs.c b/kioslave/iso/libisofs/isofs.c
index ab13d9eb9..e59945026 100644
--- a/kioslave/iso/libisofs/isofs.c
+++ b/kioslave/iso/libisofs/isofs.c
@@ -122,8 +122,8 @@ void FreeBootTable(boot_head *boot) {
 	boot->defentry=NULL;
 }
 
-int BootImageSize(int media,int len) {
-	int ret;
+int BootImageSize(int media,long len) {
+	long long ret;
 
 	switch(media & 0xf) {
 		case 0:
@@ -158,7 +158,7 @@ static boot_entry *CreateBootEntry(char *be) {
 	return entry;
 }
 
-int ReadBootTable(readfunc *read,int sector, boot_head *head, void *udata) {
+int ReadBootTable(readfunc *read,long sector, boot_head *head, void *udata) {
 
 	char buf[2048], *c, *be;
 	int i,end=0;
@@ -221,7 +221,7 @@ err:
 /**
  * Creates the linked list of the volume descriptors
  */
-iso_vol_desc *ReadISO9660(readfunc *read,int sector,void *udata) {
+iso_vol_desc *ReadISO9660(readfunc *read,long sector,void *udata) {
 				
 	int i;
 	struct iso_volume_descriptor buf;
@@ -577,10 +577,10 @@ int level=0,joliet=0,dirs,files;
 iconv_t iconv_d;
 int fd;
 
-int readf(char *buf, int start, int len,void *udata) {
+int readf(char *buf, long start, long len,void *udata) {
 	int ret;
 	
-	if ((ret=lseek(fd, start << 11, SEEK_SET))<0) return ret;
+	if ((ret=lseek64(fd, start << 11, SEEK_SET))<0) return ret;
 	ret=read(fd, buf, len << 11);
 	if (ret<0) return ret;
 	return (ret >> 11);
diff --git a/kioslave/iso/libisofs/isofs.h b/kioslave/iso/libisofs/isofs.h
index 52190e673..b8971a4c6 100644
--- a/kioslave/iso/libisofs/isofs.h
+++ b/kioslave/iso/libisofs/isofs.h
@@ -50,7 +50,7 @@ typedef struct _rr_entry {
 	int		re; /* relocated */
 	char	z_algo[2]; /* zizofs algorithm */
 	char	z_params[2]; /* zizofs parameters */
-	int		z_size; /* zizofs real_size */
+	long		z_size; /* zizofs real_size */
 } rr_entry;
 
 typedef struct _iso_vol_desc {
@@ -78,7 +78,7 @@ typedef struct _boot_head {
 /**
  * this callback function needs to read 'len' sectors from 'start' into 'buf' 
  */
-typedef int readfunc(char *buf,int start, int len,void *);
+typedef int readfunc(char *buf,long start, long len,void *);
 
 /**
  * ProcessDir uses this callback
@@ -107,7 +107,7 @@ time_t isodate_84261(char * p, int hs);
  * If the function fails, returns NULL
  * Don't forget to call FreeISO9660 after using the volume descriptor list!
  */
-iso_vol_desc *ReadISO9660(readfunc *read,int sector,void *udata);
+iso_vol_desc *ReadISO9660(readfunc *read,long sector,void *udata);
 
 /**
  * Frees the linked list of volume descriptors
@@ -140,7 +140,7 @@ int JolietLevel(struct iso_volume_descriptor *ivd);
 /**
  * Returns the size of the boot image (in 512 byte sectors)
  */
-int BootImageSize(int media,int len);
+int BootImageSize(int media,long len);
 
 /**
  * Frees the boot catalog entries in 'boot'. If you ever called ReadBootTable,
@@ -151,7 +151,7 @@ void FreeBootTable(boot_head *boot);
 /**
  * Reads the boot catalog into 'head'. Don't forget to call FreeBootTable!
  */
-int ReadBootTable(readfunc *read,int sector, boot_head *head, void *udata);
+int ReadBootTable(readfunc *read,long sector, boot_head *head, void *udata);
 
 #ifdef __cplusplus
 } //extern "C"