Index: tests/OFLHAArchiveTests.m
==================================================================
--- tests/OFLHAArchiveTests.m
+++ tests/OFLHAArchiveTests.m
@@ -41,11 +41,11 @@
 	size_t size;
 
 	[entryStream writeString: @"Hello World!"];
 	[archive close];
 
-	size = [stream seekToOffset: 0 whence: OFSeekCurrent];
+	size = (size_t)[stream seekToOffset: 0 whence: OFSeekCurrent];
 	OTAssertLessThanOrEqual(size, bufferSize);
 
 	stream = [OFMemoryStream streamWithMemoryAddress: _buffer
 						    size: size
 						writable: false];

Index: tests/OFTarArchiveTests.m
==================================================================
--- tests/OFTarArchiveTests.m
+++ tests/OFTarArchiveTests.m
@@ -46,11 +46,11 @@
 	entryStream = [archive streamForWritingEntry: entry];
 	[entryStream writeString: @"Hello World!"];
 
 	[archive close];
 
-	size = [stream seekToOffset: 0 whence: OFSeekCurrent];
+	size = (size_t)[stream seekToOffset: 0 whence: OFSeekCurrent];
 	OTAssertLessThanOrEqual(size, bufferSize);
 
 	stream = [OFMemoryStream streamWithMemoryAddress: _buffer
 						    size: size
 						writable: false];

Index: tests/OFZIPArchiveTests.m
==================================================================
--- tests/OFZIPArchiveTests.m
+++ tests/OFZIPArchiveTests.m
@@ -41,11 +41,11 @@
 	size_t size;
 
 	[entryStream writeString: @"Hello World!"];
 	[archive close];
 
-	size = [stream seekToOffset: 0 whence: OFSeekCurrent];
+	size = (size_t)[stream seekToOffset: 0 whence: OFSeekCurrent];
 	OTAssertLessThanOrEqual(size, bufferSize);
 
 	stream = [OFMemoryStream streamWithMemoryAddress: _buffer
 						    size: size
 						writable: false];

Index: tests/OFZooArchiveTests.m
==================================================================
--- tests/OFZooArchiveTests.m
+++ tests/OFZooArchiveTests.m
@@ -41,11 +41,11 @@
 	size_t size;
 
 	[entryStream writeString: @"Hello World!"];
 	[archive close];
 
-	size = [stream seekToOffset: 0 whence: OFSeekCurrent];
+	size = (size_t)[stream seekToOffset: 0 whence: OFSeekCurrent];
 	OTAssertLessThanOrEqual(size, bufferSize);
 
 	stream = [OFMemoryStream streamWithMemoryAddress: _buffer
 						    size: size
 						writable: false];