diff --git a/src/ecmascript/libdom/spidermonkey/form.cpp b/src/ecmascript/libdom/spidermonkey/form.cpp
index b8e325923..7a7bc1248 100644
--- a/src/ecmascript/libdom/spidermonkey/form.cpp
+++ b/src/ecmascript/libdom/spidermonkey/form.cpp
@@ -1402,13 +1402,6 @@ form_finalize(JS::GCContext *op, JSObject *jsform)
 	struct form *form = JS::GetMaybePtrFromReservedSlot<struct form>(jsform, 0);
 
 	if (form) {
-		/* If this assertion fails, leave fv->ecmascript_obj
-		 * unchanged, because it may point to a different
-		 * JSObject whose private pointer will later have to
-		 * be updated to avoid crashes.  */
-		assert(form->ecmascript_obj == jsform);
-		if_assert_failed return;
-
 		form->ecmascript_obj = NULL;
 		/* No need to JS::SetPrivate, because the object is
 		 * being destroyed.  */
diff --git a/src/ecmascript/libdom/spidermonkey/input.cpp b/src/ecmascript/libdom/spidermonkey/input.cpp
index 01aa102cb..61be21242 100644
--- a/src/ecmascript/libdom/spidermonkey/input.cpp
+++ b/src/ecmascript/libdom/spidermonkey/input.cpp
@@ -1858,13 +1858,6 @@ input_finalize(JS::GCContext *op, JSObject *jsinput)
 	struct form_state *fs = JS::GetMaybePtrFromReservedSlot<struct form_state>(jsinput, 0);
 
 	if (fs) {
-		/* If this assertion fails, leave fs->ecmascript_obj
-		 * unchanged, because it may point to a different
-		 * JSObject whose private pointer will later have to
-		 * be updated to avoid crashes.  */
-		assert(fs->ecmascript_obj == jsinput);
-		if_assert_failed return;
-
 		fs->ecmascript_obj = NULL;
 		/* No need to JS::SetPrivate, because jsinput is being
 		 * destroyed.  */