diff --git a/codecs/optipng/README.md b/codecs/optipng/README.md
index 27c6cca3..85bd3db0 100644
--- a/codecs/optipng/README.md
+++ b/codecs/optipng/README.md
@@ -1,6 +1,6 @@
 # OptiPNG
 
-- Source: <https://sourceforge.net/project/optipng>
+- Source: <http://optipng.sourceforge.net/>
 - Version: v0.7.7
 
 ## Dependencies