diff --git a/akka-actor/src/main/mima-filters/2.5.21.backwards.excludes b/akka-actor/src/main/mima-filters/2.5.21.backwards.excludes
index 2db94c0446..ed4a04254e 100644
--- a/akka-actor/src/main/mima-filters/2.5.21.backwards.excludes
+++ b/akka-actor/src/main/mima-filters/2.5.21.backwards.excludes
@@ -2,3 +2,5 @@
 ProblemFilters.exclude[DirectMissingMethodProblem]("akka.pattern.AskableActorRef.recipientTerminatedExcpetion")
 # No longer needed, package private implicit #26350
 ProblemFilters.exclude[DirectMissingMethodProblem]("akka.util.ccompat.package.fromCanBuildFrom")
+# Add optional field to ApiMayChange annotation #26409
+ProblemFilters.exclude[ReversedMissingMethodProblem]("akka.annotation.ApiMayChange.issue")