diff --git a/layout/generic/nsSimplePageSequence.cpp b/layout/generic/nsSimplePageSequence.cpp
index c2373341915c..8843c6c58ee5 100644
--- a/layout/generic/nsSimplePageSequence.cpp
+++ b/layout/generic/nsSimplePageSequence.cpp
@@ -108,7 +108,8 @@ nsSharedPageData::nsSharedPageData() :
   mReflowMargin(0,0,0,0),
   mShadowSize(0,0),
   mDeadSpaceMargin(0,0,0,0),
-  mExtraMargin(0,0,0,0)
+  mExtraMargin(0,0,0,0),
+  mHeadFooterGap(0)
 {
 }
 
diff --git a/layout/html/base/src/nsSimplePageSequence.cpp b/layout/html/base/src/nsSimplePageSequence.cpp
index c2373341915c..8843c6c58ee5 100644
--- a/layout/html/base/src/nsSimplePageSequence.cpp
+++ b/layout/html/base/src/nsSimplePageSequence.cpp
@@ -108,7 +108,8 @@ nsSharedPageData::nsSharedPageData() :
   mReflowMargin(0,0,0,0),
   mShadowSize(0,0),
   mDeadSpaceMargin(0,0,0,0),
-  mExtraMargin(0,0,0,0)
+  mExtraMargin(0,0,0,0),
+  mHeadFooterGap(0)
 {
 }