diff --git a/content/xbl/src/nsXBLBinding.cpp b/content/xbl/src/nsXBLBinding.cpp
index ecac6bd6c29f..fa3f89d49683 100644
--- a/content/xbl/src/nsXBLBinding.cpp
+++ b/content/xbl/src/nsXBLBinding.cpp
@@ -222,6 +222,8 @@ nsXBLBinding::nsXBLBinding(void)
 
 nsXBLBinding::~nsXBLBinding(void)
 {
+  delete mAttributeTable;
+
   gRefCnt--;
   if (gRefCnt == 0) {
     NS_RELEASE(kContentAtom);
diff --git a/layout/xbl/src/nsXBLBinding.cpp b/layout/xbl/src/nsXBLBinding.cpp
index ecac6bd6c29f..fa3f89d49683 100644
--- a/layout/xbl/src/nsXBLBinding.cpp
+++ b/layout/xbl/src/nsXBLBinding.cpp
@@ -222,6 +222,8 @@ nsXBLBinding::nsXBLBinding(void)
 
 nsXBLBinding::~nsXBLBinding(void)
 {
+  delete mAttributeTable;
+
   gRefCnt--;
   if (gRefCnt == 0) {
     NS_RELEASE(kContentAtom);