diff --git a/doc/unit-tests.md b/doc/unit-tests.md
--- a/doc/unit-tests.md
+++ b/doc/unit-tests.md
@@ -43,7 +43,7 @@
 
 For further reading, I found the following website to be helpful in
 explaining how the boost unit test framework works:
-[http://www.alittlemadness.com/2009/03/31/c-unit-testing-with-boosttest/](http://www.alittlemadness.com/2009/03/31/c-unit-testing-with-boosttest/).
+[https://legalizeadulthood.wordpress.com/2009/07/04/c-unit-tests-with-boost-test-part-1/](https://legalizeadulthood.wordpress.com/2009/07/04/c-unit-tests-with-boost-test-part-1/)
 
 ### Debugging unit tests