diff --git a/utest/reader.test.cpp b/utest/reader.test.cpp
index aa85fcc7..2c9a490d 100644
--- a/utest/reader.test.cpp
+++ b/utest/reader.test.cpp
@@ -17,7 +17,8 @@ namespace xo {
                 {"def foo : f64 = (3.14159265);"},
                 //{"def foo : f64 = 2.0 * 3.14159265;"},
                 {"def foo = lambda (x : f64) 3.1415965;"},
-                {"def foo = lambda (x : f64, y : f64) 3.1415965;"}
+                {"def foo = lambda (x : f64, y : f64) 3.1415965;"},
+                {"def foo = lambda (x : f64) x;"}
             };
         }