diff --git a/README.md b/README.md
index 9ef6ea9..361502f 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ See [the community guidelines](coc.md) to understand the conduct that is expecte
 
 ## Use Stack to get going with Haskell
 
-Get [Stack](haskellstack.org) to get GHC installed and to build your projects.
+Get [Stack](http://haskellstack.org) to get GHC installed and to build your projects.
 
 If you don't know anything about Stack and would like an overview, check out this [comprehensive Stack video tutorial](https://www.youtube.com/watch?v=sRonIB8ZStw).
 
diff --git a/install.md b/install.md
index 6be7f09..c1f564d 100644
--- a/install.md
+++ b/install.md
@@ -1,6 +1,6 @@
 # These instructions are deprecated
 
-We now recommend you use [Stack](haskellstack.org) instead, but the instructions are preserved here for those that might want a minimal install.
+We now recommend you use [Stack](http://haskellstack.org) instead, but the instructions are preserved here for those that might want a minimal install.
 
 # What are Haskell, GHC, and Cabal?