Index: src/OFZIPArchive.m
==================================================================
--- src/OFZIPArchive.m
+++ src/OFZIPArchive.m
@@ -72,11 +72,11 @@
 {
 	OFStream *_stream;
 	OFFile *_file;
 	OFZIPArchive_LocalFileHeader *_localFileHeader;
 	bool _hasDataDescriptor;
-	size_t _size;
+	uint64_t _size;
 	uint32_t _CRC32;
 	bool _atEndOfStream;
 }
 
 - initWithArchiveFile: (OFString*)path
@@ -306,11 +306,11 @@
 	size_t i;
 
 	if ((off_t)_centralDirectoryOffset != _centralDirectoryOffset)
 		@throw [OFOutOfRangeException exception];
 
-	[_file seekToOffset: _centralDirectoryOffset
+	[_file seekToOffset: (off_t)_centralDirectoryOffset
 		     whence: SEEK_SET];
 
 	_entries = [[OFMutableArray alloc] init];
 	_pathToEntryMap = [[OFMutableDictionary alloc] init];
 
@@ -358,11 +358,11 @@
 
 	offset = [entry OF_localFileHeaderOffset];
 	if ((off_t)offset != offset)
 		@throw [OFOutOfRangeException exception];
 
-	[_file seekToOffset: offset
+	[_file seekToOffset: (off_t)offset
 		     whence: SEEK_SET];
 	localFileHeader = [[[OFZIPArchive_LocalFileHeader alloc]
 	    initWithFile: _file] autorelease];
 
 	if (![localFileHeader matchesEntry: entry])
@@ -572,11 +572,11 @@
 				@throw [OFChecksumFailedException exception];
 
 			return 0;
 		}
 
-		min = (length < _size ? length : _size);
+		min = (length < _size ? length : (size_t)_size);
 		ret = [_stream readIntoBuffer: buffer
 				       length: min];
 		_size -= ret;
 	}
 

Index: utils/OFZIP.m
==================================================================
--- utils/OFZIP.m
+++ utils/OFZIP.m
@@ -176,11 +176,11 @@
 		OFEnumerator *componentEnumerator;
 		OFString *component, *directory;
 		OFStream *stream;
 		OFFile *output;
 		char buffer[BUFFER_SIZE];
-		off_t written = 0, size = [entry uncompressedSize];
+		uint64_t written = 0, size = [entry uncompressedSize];
 		int_fast8_t percent = -1, newPercent;
 
 		if (!all && ![files containsObject: fileName])
 			continue;