diff --git a/Stackage/Config.hs b/Stackage/Config.hs
index 01a19c5f..586f6c1e 100644
--- a/Stackage/Config.hs
+++ b/Stackage/Config.hs
@@ -84,6 +84,9 @@ defaultStablePackages = execWriter $ do
 
     mapM_ (add "Simon Hengel <sol@typeful.net>") $ words
         "hspec doctest base-compat"
+
+    -- Issue #21
+    addRange "Michael Snoyman" "hashable" "< 1.2"
   where
     add maintainer package = addRange maintainer package "-any"
     addRange maintainer package range =