diff --git a/src/share/classes/java/util/concurrent/Callable.java b/src/share/classes/java/util/concurrent/Callable.java
index 53bde82bebd0c34fa1da2d8e554ab2f9e745fd8a..04bc60750635e31fd9fb9e11b8270220cb2c2af5 100644
--- a/src/share/classes/java/util/concurrent/Callable.java
+++ b/src/share/classes/java/util/concurrent/Callable.java
@@ -54,6 +54,7 @@ package java.util.concurrent;
  * @author Doug Lea
  * @param <V> the result type of method {@code call}
  */
+@FunctionalInterface
 public interface Callable<V> {
     /**
      * Computes a result, or throws an exception if unable to do so.