@@ -101,11 +101,11 @@
 
 	if (_fd == -1 || _atEndOfStream)
 		@throw [OFReadFailedException exceptionWithObject: self
 						  requestedLength: length];
 
-#ifndef _WIN32
+#ifndef OF_WINDOWS
 	if ((ret = read(_fd, buffer, length)) < 0)
 		@throw [OFReadFailedException exceptionWithObject: self
 						  requestedLength: length
 							    errNo: errno];
 #else
@@ -129,11 +129,11 @@
 {
 	if (_fd == -1 || _atEndOfStream)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length];
 
-#ifndef _WIN32
+#ifndef OF_WINDOWS
 	if (length > SSIZE_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	if (write(_fd, buffer, length) != (ssize_t)length)
 		@throw [OFWriteFailedException exceptionWithObject: self