diff --git a/prototyping/Tests/Interpreter/return_nil/out.txt b/prototyping/Tests/Interpreter/return_nil/out.txt
index 607602cf..a4ab58d1 100644
--- a/prototyping/Tests/Interpreter/return_nil/out.txt
+++ b/prototyping/Tests/Interpreter/return_nil/out.txt
@@ -1 +1 @@
-nil
+not nil