@@ -28,11 +28,11 @@
  *	  for an underlying stream.
  */
 @interface OFGZIPStream: OFStream
 {
 	OFStream *_stream;
-	OFInflateStream *_inflateStream;
+	OFInflateStream *_Nullable _inflateStream;
 	enum of_gzip_stream_state {
 		OF_GZIP_STREAM_ID1,
 		OF_GZIP_STREAM_ID2,
 		OF_GZIP_STREAM_COMPRESSION_METHOD,
 		OF_GZIP_STREAM_FLAGS,
@@ -73,11 +73,11 @@
 		OF_GZIP_STREAM_OS_ACORN_RISCOS =  13,
 		OF_GZIP_STREAM_OS_UNKNOWN      = 255
 	} _OS;
 	size_t _bytesRead;
 	uint8_t _buffer[4];
-	OFDate *_modificationDate;
+	OFDate *_Nullable _modificationDate;
 	uint16_t _extraLength;
 	uint32_t _CRC32, _uncompressedSize;
 }
 
 /*!