diff --git a/direct/src/interval/ActorInterval.py b/direct/src/interval/ActorInterval.py
index 8592e99166..7629e2831b 100644
--- a/direct/src/interval/ActorInterval.py
+++ b/direct/src/interval/ActorInterval.py
@@ -61,8 +61,8 @@ class ActorInterval(Interval):
         # Initialize superclass
 	Interval.__init__(self, name, duration, reverse=reverse)
         # Update stopEvent
+        self.stopEvent = id + '_stopEvent'
         if self.loop:
-            self.stopEvent = id + '_stopEvent'
             self.stopEventList = [self.stopEvent]
 
     def calcFrame(self, t):
@@ -116,7 +116,7 @@ class ActorInterval(Interval):
                 self.goToT(t)
                 # And start loop, restart flag says continue from current frame
                 self.actor.loop(self.animName, restart=0)
-                self.accept(self.stopEvent, self.actor.stop)
+                self.acceptOnce(self.stopEvent, self.actor.stop)
                 # Print debug information
                 self.notify.debug(
                     'updateFunc() - IVAL_INIT %s looping anim' %
diff --git a/direct/src/interval/SoundInterval.py b/direct/src/interval/SoundInterval.py
index a3cd4c33a0..da2d99ac54 100644
--- a/direct/src/interval/SoundInterval.py
+++ b/direct/src/interval/SoundInterval.py
@@ -44,10 +44,10 @@ class SoundInterval(Interval):
         # Initialize superclass
         Interval.__init__(self, name, duration)
         # Update stopEvent
+        self.stopEvent = id + '_stopEvent'
         if self.wantSound:
-            self.stopEvent = id + '_stopEvent'
             self.stopEventList = [self.stopEvent]
-        
+
     def updateFunc(self, t, event = IVAL_NONE):
         """ updateFunc(t, event)
         Go to time t
@@ -68,7 +68,8 @@ class SoundInterval(Interval):
             # Start sound
             AudioManager.play(self.sound, t, self.loop)
             # Accept event to kill sound
-            self.accept(self.stopEvent, lambda s = self: AudioManager.stop(s.sound))
+            self.acceptOnce(self.stopEvent,
+                        lambda s = self: AudioManager.stop(s.sound))
         # Print debug information
         self.notify.debug('updateFunc() - %s: t = %f' % (self.name, t))