diff --git a/accessible/src/html/nsHTMLFormControlAccessible.cpp b/accessible/src/html/nsHTMLFormControlAccessible.cpp
index 8f7e2752e2e0..ee2e44c18972 100644
--- a/accessible/src/html/nsHTMLFormControlAccessible.cpp
+++ b/accessible/src/html/nsHTMLFormControlAccessible.cpp
@@ -212,7 +212,7 @@ NS_IMETHODIMP nsHTMLButtonAccessible::GetAccName(nsAWritableString& _retval)
 // ----- HTML 4 Button: can contain arbitrary HTML content -----
 
 nsHTML4ButtonAccessible::nsHTML4ButtonAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell):
-nsBlockAccessible(aNode, aShell)
+nsLeafAccessible(aNode, aShell)
 { 
 }
 
diff --git a/accessible/src/html/nsHTMLFormControlAccessible.h b/accessible/src/html/nsHTMLFormControlAccessible.h
index de85c1b170a2..31d64874d1b1 100644
--- a/accessible/src/html/nsHTMLFormControlAccessible.h
+++ b/accessible/src/html/nsHTMLFormControlAccessible.h
@@ -78,7 +78,7 @@ public:
   NS_IMETHOD AccDoAction(PRUint8 index);
 };
 
-class nsHTML4ButtonAccessible : public nsBlockAccessible
+class nsHTML4ButtonAccessible : public nsLeafAccessible
 {
 
 public: