diff --git a/t/lib/StringifyingException.pm b/t/lib/StringifyingException.pm
index aaf6e6d..1e25d22 100644
--- a/t/lib/StringifyingException.pm
+++ b/t/lib/StringifyingException.pm
@@ -3,9 +3,14 @@ use Kelp::Base;
 
 attr data => undef;
 
-use overload q{""} => sub {
+use overload
+    q{""} => 'stringify',
+    fallback => 1,
+;
+
+sub stringify {
     return 'Exception with data: [' . (join ',', @{$_[0]->data}) . ']';
-};
+}
 
 1;