diff --git a/mozilla/content/html/content/src/nsHTMLSelectElement.cpp b/mozilla/content/html/content/src/nsHTMLSelectElement.cpp
index 20544991453..9a52e8b5a8a 100644
--- a/mozilla/content/html/content/src/nsHTMLSelectElement.cpp
+++ b/mozilla/content/html/content/src/nsHTMLSelectElement.cpp
@@ -1540,6 +1540,7 @@ NS_IMPL_BOOL_ATTR(nsHTMLSelectElement, Disabled, disabled)
 NS_IMPL_BOOL_ATTR(nsHTMLSelectElement, Multiple, multiple)
 NS_IMPL_STRING_ATTR(nsHTMLSelectElement, Name, name)
 NS_IMPL_INT_ATTR(nsHTMLSelectElement, Size, size)
+NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLSelectElement, Size, size, 0)
 NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLSelectElement, TabIndex, tabindex, 0)
 
 NS_IMETHODIMP