diff --git a/xo-interpreter/utest/StackFrame.test.cpp b/xo-interpreter/utest/StackFrame.test.cpp
index 3d501a68..b59cfd6d 100644
--- a/xo-interpreter/utest/StackFrame.test.cpp
+++ b/xo-interpreter/utest/StackFrame.test.cpp
@@ -33,6 +33,7 @@ namespace xo {
                 Testcase_StackFrame({}),
                 Testcase_StackFrame({}),
                 Testcase_StackFrame({111}),
+                Testcase_StackFrame({111, 222}),
             };
         }