diff --git a/modules/clipper2/clipper2.moon b/modules/clipper2/clipper2.moon
index b206cd3..20d85fe 100644
--- a/modules/clipper2/clipper2.moon
+++ b/modules/clipper2/clipper2.moon
@@ -75,7 +75,8 @@ Enums = {
 
 SetEnum = (enumName, n) ->
 	if type(n) == "string"
-		assert Enums[enumName][n], "#{enumName} undefined"
+		n = Enums[enumName][n]
+		assert n, "#{enumName} undefined"
 	return n
 
 -- lib