diff --git a/compiler/tests/interface_test.v b/compiler/tests/interface_test.v
index 8bee5dde51..09df37643e 100644
--- a/compiler/tests/interface_test.v
+++ b/compiler/tests/interface_test.v
@@ -1,4 +1,5 @@
 struct Dog {
+	breed string
 }
 
 fn (d Dog) speak() {