diff --git a/src/main/java/org/apache/commons/collections4/Transformer.java b/src/main/java/org/apache/commons/collections4/Transformer.java index 5bf3223614..221b95729b 100644 --- a/src/main/java/org/apache/commons/collections4/Transformer.java +++ b/src/main/java/org/apache/commons/collections4/Transformer.java @@ -40,6 +40,7 @@ * @deprecated Use {@link Function}. */ @Deprecated +@FunctionalInterface public interface Transformer extends Function { @Override