diff --git a/content/smil/nsSMILTimedElement.cpp b/content/smil/nsSMILTimedElement.cpp
index eaeae976b25..54a13f66394 100644
--- a/content/smil/nsSMILTimedElement.cpp
+++ b/content/smil/nsSMILTimedElement.cpp
@@ -1312,7 +1312,13 @@ nsSMILTimedElement::ClearSpecs(TimeValueSpecList& aSpecs,
                                InstanceTimeList& aInstances,
                                RemovalTestFunction aRemove)
 {
+  AutoIntervalUpdateBatcher(*this);
+
+  for (PRUint32 i = 0; i < aSpecs.Length(); ++i) {
+    aSpecs[i]->Unlink();
+  }
   aSpecs.Clear();
+
   RemoveByFunction removeByFunction(aRemove);
   RemoveInstanceTimes(aInstances, removeByFunction);
 }