diff --git a/engine/runtime/src/main/scala/org/enso/interpreter/runtime/IrToTruffle.scala b/engine/runtime/src/main/scala/org/enso/interpreter/runtime/IrToTruffle.scala
index c4e7b6339bb0..024fc9b2358b 100644
--- a/engine/runtime/src/main/scala/org/enso/interpreter/runtime/IrToTruffle.scala
+++ b/engine/runtime/src/main/scala/org/enso/interpreter/runtime/IrToTruffle.scala
@@ -2254,7 +2254,7 @@ class IrToTruffle(
               moduleScope,
               defaultExpression,
               null,
-              s"<default::$scopeName::${arg.name}>",
+              s"<default::$scopeName::${arg.name.showCode()}>",
               false,
               false
             )