diff --git a/mkhufftbl.py b/mkhufftbl.py
index 6c8cca98..a9f10d75 100755
--- a/mkhufftbl.py
+++ b/mkhufftbl.py
@@ -5,7 +5,7 @@
 # and decoding tables in C language.  The resulting code is used in
 # lib/nghttp2_hd_huffman.h and lib/nghttp2_hd_huffman_data.c
 #
-# [1] http://http2.github.io/http2-spec/compression.html
+# [1] https://httpwg.org/specs/rfc7541.html
 
 import re
 import sys
diff --git a/mkstatichdtbl.py b/mkstatichdtbl.py
index 994a7736..20f0c153 100755
--- a/mkstatichdtbl.py
+++ b/mkstatichdtbl.py
@@ -5,7 +5,7 @@
 # nghttp2_hd_static_entry table.  This table is used in
 # lib/nghttp2_hd.c.
 #
-# [1] http://http2.github.io/http2-spec/compression.html
+# [1] https://httpwg.org/specs/rfc7541.html
 
 import re, sys