diff --git a/src/component.js b/src/component.js
index a215592f87..b56c1bcb30 100644
--- a/src/component.js
+++ b/src/component.js
@@ -136,11 +136,12 @@ function renderComponent(component) {
 			newVNode,
 			oldVNode,
 			component._globalContext,
-			component._parentDom.namespaceURI == 'http://www.w3.org/1999/xhtml'
-				? 1
-				: component._parentDom.namespaceURI == 'http://www.w3.org/2000/svg'
+			component._parentDom.namespaceURI == 'http://www.w3.org/2000/svg'
 				? 2
-				: 3,
+				: component._parentDom.namespaceURI ==
+				  'http://www.w3.org/1998/Math/MathML'
+				? 3
+				: 1,
 			oldVNode._flags & MODE_HYDRATE ? [oldDom] : null,
 			commitQueue,
 			oldDom == null ? getDomSibling(oldVNode) : oldDom,
diff --git a/src/render.js b/src/render.js
index dccc97f226..2861befbee 100644
--- a/src/render.js
+++ b/src/render.js
@@ -41,11 +41,11 @@ export function render(vnode, parentDom, replaceNode) {
 		vnode,
 		oldVNode || EMPTY_OBJ,
 		EMPTY_OBJ,
-		parentDom.namespaceURI == 'http://www.w3.org/1999/xhtml'
-			? 1
-			: parentDom.namespaceURI == 'http://www.w3.org/2000/svg'
+		parentDom.namespaceURI == 'http://www.w3.org/2000/svg'
 			? 2
-			: 3,
+			: parentDom.namespaceURI == 'http://www.w3.org/1998/Math/MathML'
+			? 3
+			: 1,
 		!isHydrating && replaceNode
 			? [replaceNode]
 			: oldVNode