diff --git a/koans-solved/triangle-project.lisp b/koans-solved/triangle-project.lisp
index c505884..b19f9f6 100644
--- a/koans-solved/triangle-project.lisp
+++ b/koans-solved/triangle-project.lisp
@@ -40,6 +40,7 @@
   (assert-equal :isosceles (triangle 3 4 4))
   (assert-equal :isosceles (triangle 4 3 4))
   (assert-equal :isosceles (triangle 4 4 3))
+  (assert-equal :isosceles (triangle 2 2 3))
   (assert-equal :isosceles (triangle 10 10 2)))
 
 (define-test scalene-triangles
diff --git a/koans/triangle-project.lisp b/koans/triangle-project.lisp
index 275f034..a08da93 100644
--- a/koans/triangle-project.lisp
+++ b/koans/triangle-project.lisp
@@ -30,6 +30,7 @@
   (assert-equal :isosceles (triangle 3 4 4))
   (assert-equal :isosceles (triangle 4 3 4))
   (assert-equal :isosceles (triangle 4 4 3))
+  (assert-equal :isosceles (triangle 2 2 3))
   (assert-equal :isosceles (triangle 10 10 2)))
 
 (define-test scalene-triangles