diff --git a/AddHandler.hs b/AddHandler.hs
--- a/AddHandler.hs
+++ b/AddHandler.hs
@@ -84,13 +84,22 @@
     methods <- getLine
     addHandlerFiles cabal routePair pattern methods
 
+getRoutesFilePath :: IO FilePath
+getRoutesFilePath = do
+    let oldPath = "config/routes"
+    oldExists <- doesFileExist oldPath
+    pure $ if oldExists
+        then oldPath
+        else "config/routes.yesodroutes"
+
 addHandlerFiles :: FilePath -> (String, FilePath) -> String -> String -> IO ()
 addHandlerFiles cabal (name, handlerFile) pattern methods = do
     src <- getSrcDir cabal
     let applicationFile = concat [src, "/Application.hs"]
     modify applicationFile $ fixApp name
     modify cabal $ fixCabal name
-    modify "config/routes" $ fixRoutes name pattern methods
+    routesPath <- getRoutesFilePath
+    modify routesPath $ fixRoutes name pattern methods
     writeFile handlerFile $ mkHandler name pattern methods
     specExists <- doesFileExist specFile
     unless specExists $
diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # ChangeLog for yesod-bin
 
+## 1.6.0.6
+
+Fix the `add-handler` subcommand to support both the old default routes filename (`routes`) and the new one (`routes.yesodroutes`) [#1688](https://github.com/yesodweb/yesod/pull/1688)
+
 ## 1.6.0.5
 
 * Use process groups to ensure GHC is killed on Ctrl-C [#1683](https://github.com/yesodweb/yesod/pull/1683)
diff --git a/yesod-bin.cabal b/yesod-bin.cabal
--- a/yesod-bin.cabal
+++ b/yesod-bin.cabal
@@ -1,5 +1,5 @@
 name:            yesod-bin
-version:         1.6.0.5
+version:         1.6.0.6
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>