diff --git a/dom/base/nsXMLContentSerializer.h b/dom/base/nsXMLContentSerializer.h
index ce2967f1b3ef..941acb1790da 100644
--- a/dom/base/nsXMLContentSerializer.h
+++ b/dom/base/nsXMLContentSerializer.h
@@ -336,7 +336,7 @@ class nsXMLContentSerializer : public nsIContentSerializer {
   nsTArray<NameSpaceDecl> mNameSpaceStack;
 
   // nsIDocumentEncoder flags
-  uint32_t  mFlags;
+  MOZ_INIT_OUTSIDE_CTOR uint32_t  mFlags;
 
   // characters to use for line break
   nsString  mLineBreak;
@@ -348,20 +348,20 @@ class nsXMLContentSerializer : public nsIContentSerializer {
   uint32_t   mColPos;
 
   // true = pretty formating should be done (OutputFormated flag)
-  bool mDoFormat;
+  MOZ_INIT_OUTSIDE_CTOR bool mDoFormat;
 
   // true = no formatting,(OutputRaw flag)
   // no newline convertion and no rewrap long lines even if OutputWrap is set.
-  bool mDoRaw;
+  MOZ_INIT_OUTSIDE_CTOR bool mDoRaw;
 
   // true = wrapping should be done (OutputWrap flag)
-  bool mDoWrap;
+  MOZ_INIT_OUTSIDE_CTOR bool mDoWrap;
 
   // true = we can break lines (OutputDisallowLineBreaking flag)
-  bool mAllowLineBreaking;
+  MOZ_INIT_OUTSIDE_CTOR bool mAllowLineBreaking;
 
   // number of maximum column in a line, in the wrap mode
-  uint32_t   mMaxColumn;
+  MOZ_INIT_OUTSIDE_CTOR uint32_t   mMaxColumn;
 
   // current indent value
   nsString   mIndent;
@@ -397,7 +397,7 @@ class nsXMLContentSerializer : public nsIContentSerializer {
 
 private:
   // number of nested elements which have preformated content
-  int32_t       mPreLevel;
+  MOZ_INIT_OUTSIDE_CTOR int32_t mPreLevel;
 };
 
 nsresult
diff --git a/dom/xul/templates/nsXULSortService.h b/dom/xul/templates/nsXULSortService.h
index c003974ead8b..306481e0d4c0 100644
--- a/dom/xul/templates/nsXULSortService.h
+++ b/dom/xul/templates/nsXULSortService.h
@@ -42,23 +42,24 @@ enum nsSortState_direction {
 struct nsSortState
 {
   bool initialized;
-  bool invertSort;
-  bool inbetweenSeparatorSort;
-  bool sortStaticsLast;
-  bool isContainerRDFSeq;
+  MOZ_INIT_OUTSIDE_CTOR bool invertSort;
+  MOZ_INIT_OUTSIDE_CTOR bool inbetweenSeparatorSort;
+  MOZ_INIT_OUTSIDE_CTOR bool sortStaticsLast;
+  MOZ_INIT_OUTSIDE_CTOR bool isContainerRDFSeq;
 
   uint32_t sortHints;
 
-  nsSortState_direction direction;
+  MOZ_INIT_OUTSIDE_CTOR nsSortState_direction direction;
   nsAutoString sort;
   nsCOMArray<nsIAtom> sortKeys;
 
   nsCOMPtr<nsIXULTemplateQueryProcessor> processor;
   nsCOMPtr<nsIContent> lastContainer;
-  bool lastWasFirst, lastWasLast;
+  MOZ_INIT_OUTSIDE_CTOR bool lastWasFirst, lastWasLast;
 
   nsSortState()
     : initialized(false),
+      isContainerRDFSeq(false),
       sortHints(0)
   {
   }