diff --git a/implementations/Elm/src/Joy.elm b/implementations/Elm/src/Joy.elm
index 4338129..dac5dbe 100644
--- a/implementations/Elm/src/Joy.elm
+++ b/implementations/Elm/src/Joy.elm
@@ -36,6 +36,7 @@ joy stack expression =
 joy_eval : String -> JList -> JList -> Result String (JList, JList)
 joy_eval symbol stack expression =
     case symbol of
+        "" -> Ok (stack, expression)
 
         "branch" -> joy_branch stack expression
         "i" -> joy_i stack expression