diff --git a/contrib/ports/unix/check/README b/contrib/ports/unix/check/README
index 3d678663..8b326724 100644
--- a/contrib/ports/unix/check/README
+++ b/contrib/ports/unix/check/README
@@ -1,7 +1,7 @@
 
 Helper files to run lwIP unit tests on unix-like systems.
 
-1. Install the check library, through a package manager or from http://check.sourceforge.net/
+1. Install the check library, through a package manager or from https://libcheck.github.io/check/
 2. Put the lwip code in a directory called 'lwip'
 3. Run `make check`
 4. Make sure all tests pass