diff --git a/remote/src/main/mima-filters/1.1.x.backwards.excludes/quarantine.backwards.excludes b/remote/src/main/mima-filters/1.1.x.backwards.excludes/quarantine.backwards.excludes
index 2d8378e9f0..bcf9400738 100644
--- a/remote/src/main/mima-filters/1.1.x.backwards.excludes/quarantine.backwards.excludes
+++ b/remote/src/main/mima-filters/1.1.x.backwards.excludes/quarantine.backwards.excludes
@@ -21,3 +21,4 @@ ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.remote.arte
 ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.remote.artery.AssociationState#QuarantinedTimestamp.this")
 ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.remote.artery.AssociationState#QuarantinedTimestamp.apply")
 ProblemFilters.exclude[IncompatibleSignatureProblem]("org.apache.pekko.remote.artery.AssociationState#QuarantinedTimestamp.unapply")
+ProblemFilters.exclude[MissingTypesProblem]("org.apache.pekko.remote.artery.AssociationState$QuarantinedTimestamp$")