diff --git a/smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java b/smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java
index ffc622633..443785dba 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java
@@ -149,9 +149,7 @@ public class SmackReactor {
         long releaseTimeEpoch = System.currentTimeMillis() + unit.toMillis(delay);
         Date releaseTimeDate = new Date(releaseTimeEpoch);
         ScheduledAction scheduledAction = new ScheduledAction(runnable, releaseTimeDate, this);
-        synchronized (scheduledActions) {
-            scheduledActions.add(scheduledAction);
-        }
+        scheduledActions.add(scheduledAction);
         return scheduledAction;
     }