diff --git a/mozilla/modules/libpr0n/src/imgContainer.cpp b/mozilla/modules/libpr0n/src/imgContainer.cpp
index c82527743e3..e7051bd0825 100644
--- a/mozilla/modules/libpr0n/src/imgContainer.cpp
+++ b/mozilla/modules/libpr0n/src/imgContainer.cpp
@@ -32,7 +32,8 @@
 NS_IMPL_ISUPPORTS3(imgContainer, imgIContainer, nsITimerCallback,imgIDecoderObserver)
 
 //******************************************************************************
-imgContainer::imgContainer()
+imgContainer::imgContainer() :
+  mSize(0,0)
 {
   NS_INIT_ISUPPORTS();
   /* member initializers and constructor code */