diff --git a/mozilla/string/public/nsBufferHandleUtils.h b/mozilla/string/public/nsBufferHandleUtils.h
index 2e21b8ac592..6f05fabe22a 100644
--- a/mozilla/string/public/nsBufferHandleUtils.h
+++ b/mozilla/string/public/nsBufferHandleUtils.h
@@ -64,7 +64,7 @@ NS_DataAfterHandle( HandleT* aHandlePtr, const CharT* aDummyCharTPtr )
 
 template <class HandleT, class CharT>
 HandleT*
-NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity=1 )
+NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity )
   {
     typedef CharT* CharT_ptr;
 
diff --git a/mozilla/xpcom/ds/nsBufferHandleUtils.h b/mozilla/xpcom/ds/nsBufferHandleUtils.h
index 2e21b8ac592..6f05fabe22a 100644
--- a/mozilla/xpcom/ds/nsBufferHandleUtils.h
+++ b/mozilla/xpcom/ds/nsBufferHandleUtils.h
@@ -64,7 +64,7 @@ NS_DataAfterHandle( HandleT* aHandlePtr, const CharT* aDummyCharTPtr )
 
 template <class HandleT, class CharT>
 HandleT*
-NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity=1 )
+NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity )
   {
     typedef CharT* CharT_ptr;
 
diff --git a/mozilla/xpcom/string/public/nsBufferHandleUtils.h b/mozilla/xpcom/string/public/nsBufferHandleUtils.h
index 2e21b8ac592..6f05fabe22a 100644
--- a/mozilla/xpcom/string/public/nsBufferHandleUtils.h
+++ b/mozilla/xpcom/string/public/nsBufferHandleUtils.h
@@ -64,7 +64,7 @@ NS_DataAfterHandle( HandleT* aHandlePtr, const CharT* aDummyCharTPtr )
 
 template <class HandleT, class CharT>
 HandleT*
-NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity=1 )
+NS_AllocateContiguousHandleWithData( const HandleT* aDummyHandlePtr, const basic_nsAReadableString<CharT>& aDataSource, PRUint32 aAdditionalCapacity )
   {
     typedef CharT* CharT_ptr;