diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index 4c7d24f8f4f..0242363dbf7 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -1216,17 +1216,15 @@ impl Node {
         // Step 4-5.
         match node.type_id() {
             TextNodeTypeId => {
-                match node.parent_node().root() {
-                    Some(ref parent) if parent.is_document() => return Err(HierarchyRequest),
-                    _ => ()
+                if parent.is_document() {
+                    return Err(HierarchyRequest);
                 }
-            }
+            },
             DoctypeNodeTypeId => {
-                match node.parent_node().root() {
-                    Some(ref parent) if !parent.is_document() => return Err(HierarchyRequest),
-                    _ => ()
+                if !parent.is_document() {
+                    return Err(HierarchyRequest);
                 }
-            }
+            },
             DocumentFragmentNodeTypeId |
             ElementNodeTypeId(_) |
             ProcessingInstructionNodeTypeId |
diff --git a/tests/wpt/metadata/dom/nodes/Node-insertBefore.html.ini b/tests/wpt/metadata/dom/nodes/Node-insertBefore.html.ini
deleted file mode 100644
index fa7f987c0dc..00000000000
--- a/tests/wpt/metadata/dom/nodes/Node-insertBefore.html.ini
+++ /dev/null
@@ -1,11 +0,0 @@
-[Node-insertBefore.html]
-  type: testharness
-  [If the context node is a document, inserting a document or text node should throw a HierarchyRequestError.]
-    expected: FAIL
-
-  [If the context node is a DocumentFragment, inserting a document or a doctype should throw a HierarchyRequestError.]
-    expected: FAIL
-
-  [If the context node is an element, inserting a document or a doctype should throw a HierarchyRequestError.]
-    expected: FAIL
-