diff --git a/src/libFLAC/stream_encoder.c b/src/libFLAC/stream_encoder.c
index bd956340..029bfc64 100644
--- a/src/libFLAC/stream_encoder.c
+++ b/src/libFLAC/stream_encoder.c
@@ -1288,8 +1288,13 @@ static FLAC__StreamEncoderInitStatus init_FILE_internal_(
 	if(file == stdout)
 		file = get_binary_stdout_(); /* just to be safe */
 
-	setvbuf(file, NULL, _IOFBF, 10*1024*1024); /* 10MB output buffer to help reduce disk fragmentation */
-
+#ifdef _WIN32
+	/*
+	 * Windows can suffer quite badly from disk fragmentation. This can be
+	 * reduced significantly by setting the output buffer size to be 10MB.
+	 */
+	setvbuf(file, NULL, _IOFBF, 10*1024*1024);
+#endif
 	encoder->private_->file = file;
 
 	encoder->private_->progress_callback = progress_callback;