diff --git a/note/answers/chapter10_functions.md b/note/answers/chapter10_functions.md
index e74901040..c3c077ad0 100644
--- a/note/answers/chapter10_functions.md
+++ b/note/answers/chapter10_functions.md
@@ -40,7 +40,7 @@
     separately, since lambdas won't have one:
 
     ```java
-    class LoxFunction implements Callable {
+    class LoxFunction implements LoxCallable {
       private final String name;
       private final Expr.Function declaration;
       private final Environment closure;