diff --git a/tests/mini/bug189_interfacecast.d b/tests/mini/bug189_interfacecast.d
new file mode 100644
index 00000000..1fa29764
--- /dev/null
+++ b/tests/mini/bug189_interfacecast.d
@@ -0,0 +1,11 @@
+interface I {}
+class A : I {}
+class B : A {}
+
+void main () {
+    A a = new A;
+    I i = a;
+
+    assert(!cast(B)a);
+    assert(!cast(B)i);
+}