diff --git a/mozilla/content/svg/content/src/nsSVGValue.cpp b/mozilla/content/svg/content/src/nsSVGValue.cpp
index 2b5097a73c1..ea235ea00bf 100644
--- a/mozilla/content/svg/content/src/nsSVGValue.cpp
+++ b/mozilla/content/svg/content/src/nsSVGValue.cpp
@@ -108,8 +108,10 @@ nsSVGValue::AddObserver(nsISVGValueObserver* observer)
   // stroke and fill.  Safe, as on a style change we remove both, as
   // the change notification isn't fine grained, and re-add as
   // appropriate.
-  if (mObservers.IndexOf((void*)wr) >= 0)
+  if (mObservers.IndexOf((void*)wr) >= 0) {
+    NS_RELEASE(wr);
     return NS_OK;
+  }
 
   mObservers.AppendElement((void*)wr);
   return NS_OK;