--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -104,17 +104,17 @@ SpammyLayoutWarningsEnabled()
     sValueInitialized = true;
   }
 
   return sValue;
 }
 #endif
 
 void*
-AnimatedGeometryRoot::operator new(size_t aSize, nsDisplayListBuilder* aBuilder)
+AnimatedGeometryRoot::operator new(size_t aSize, nsDisplayListBuilder* aBuilder) CPP_THROW_NEW
 {
   return aBuilder->Allocate(aSize);
 }
 
 static inline CSSAngle
 MakeCSSAngle(const nsCSSValue& aValue)
 {
   return CSSAngle(aValue.GetAngleValue(), aValue.GetUnit());