diff --git a/content/base/src/nsDOMAttributeMap.cpp b/content/base/src/nsDOMAttributeMap.cpp
index 34c8950ce41..d71bf8be126 100644
--- a/content/base/src/nsDOMAttributeMap.cpp
+++ b/content/base/src/nsDOMAttributeMap.cpp
@@ -81,6 +81,7 @@ nsDOMAttributeMap::~nsDOMAttributeMap()
 {
   if (nsnull != mAttributes) {
     PL_HashTableEnumerateEntries(mAttributes, RemoveAttributes, nsnull);
+    PL_HashTableDestroy(mAttributes);
   }
 }
 
diff --git a/layout/base/src/nsDOMAttributeMap.cpp b/layout/base/src/nsDOMAttributeMap.cpp
index 34c8950ce41..d71bf8be126 100644
--- a/layout/base/src/nsDOMAttributeMap.cpp
+++ b/layout/base/src/nsDOMAttributeMap.cpp
@@ -81,6 +81,7 @@ nsDOMAttributeMap::~nsDOMAttributeMap()
 {
   if (nsnull != mAttributes) {
     PL_HashTableEnumerateEntries(mAttributes, RemoveAttributes, nsnull);
+    PL_HashTableDestroy(mAttributes);
   }
 }