diff --git a/distrib/jpeg-6b/jdphuff.c b/distrib/jpeg-6b/jdphuff.c
index 922017e..cccfdd9 100644
--- a/distrib/jpeg-6b/jdphuff.c
+++ b/distrib/jpeg-6b/jdphuff.c
@@ -82,6 +82,10 @@
 					     JBLOCKROW *MCU_data));
 METHODDEF(boolean) decode_mcu_AC_refine JPP((j_decompress_ptr cinfo,
 					     JBLOCKROW *MCU_data));
+GLOBAL(void) jpeg_configure_huffman_decoder_progressive(
+		j_decompress_ptr cinfo, huffman_offset_data offset);
+GLOBAL(void) jpeg_get_huffman_decoder_configuration_progressive(
+	        j_decompress_ptr cinfo, huffman_offset_data *offset);
 
 /*
  * Initialize for a Huffman-compressed scan.