diff --git a/modules/lang/haskell/config.el b/modules/lang/haskell/config.el
index 3c2159f6c..dd5b6d1b4 100644
--- a/modules/lang/haskell/config.el
+++ b/modules/lang/haskell/config.el
@@ -12,6 +12,7 @@
 
 (after! haskell-mode
   (add-hook 'haskell-mode-hook #'interactive-haskell-mode)
+  (set-lookup-handlers! 'haskell-mode :definition #'haskell-mode-jump-to-def-or-tag)
   (set-file-template! 'haskell-mode :trigger #'haskell-auto-insert-module-template :project t)
   (set-repl-handler! '(haskell-mode haskell-cabal-mode literate-haskell-mode) #'+haskell-repl-buffer)
   (add-to-list 'completion-ignored-extensions ".hi"))