@@ -98,11 +98,11 @@
 
 			if (![_stream isKindOfClass: [OFSeekableStream class]])
 				@throw [OFInvalidArgumentException exception];
 
 			[(OFSeekableStream *)_stream seekToOffset: -1024
-							   whence: SEEK_END];
+							   whence: OFSeekEnd];
 			[_stream readIntoBuffer: buffer exactLength: 1024];
 
 			for (size_t i = 0; i < 1024 / sizeof(uint32_t); i++)
 				if (buffer[i] != 0)
 					empty = false;
@@ -109,11 +109,11 @@
 
 			if (!empty)
 				@throw [OFInvalidFormatException exception];
 
 			[(OFSeekableStream *)stream seekToOffset: -1024
-							  whence: SEEK_END];
+							  whence: OFSeekEnd];
 		}
 
 		_encoding = OFStringEncodingUTF8;
 	} @catch (id e) {
 		[self release];
@@ -363,20 +363,20 @@
 	    (OFStreamOffset)_toRead == (long long)_toRead) {
 		unsigned long long size;
 
 		[(OFSeekableStream *)_stream
 		    seekToOffset: (OFStreamOffset)_toRead
-			  whence: SEEK_CUR];
+			  whence: OFSeekCurrent];
 
 		_toRead = 0;
 
 		size = _entry.size;
 
 		if (size % 512 != 0)
 			[(OFSeekableStream *)_stream
 			    seekToOffset: 512 - (size % 512)
-				  whence: SEEK_CUR];
+				  whence: OFSeekCurrent];
 	} else {
 		char buffer[512];
 		unsigned long long size;
 
 		while (_toRead >= 512) {