diff --git a/exercises/practice/protein-translation/protein-translation.spec.coffee b/exercises/practice/protein-translation/protein-translation.spec.coffee
index 767073f..3155567 100644
--- a/exercises/practice/protein-translation/protein-translation.spec.coffee
+++ b/exercises/practice/protein-translation/protein-translation.spec.coffee
@@ -134,4 +134,4 @@ describe 'ProteinTranslation', ->
   xit "Non-existing codon can't translate", ->
     expect ->
       ProteinTranslation.proteins("AAA")
-    .toThrowError("Invalid codon")
+    .toThrowError(Error, "Invalid codon")