diff --git a/lib/ast-to-react.js b/lib/ast-to-react.js
index afa847e6..975cbc40 100644
--- a/lib/ast-to-react.js
+++ b/lib/ast-to-react.js
@@ -107,6 +107,7 @@ import {svg, find, hastToReact} from 'property-information'
 import {stringify as spaces} from 'space-separated-tokens'
 import {stringify as commas} from 'comma-separated-tokens'
 import style from 'style-to-object'
+import {uriTransformer} from './uri-transformer.js'
 
 const own = {}.hasOwnProperty
 
@@ -162,6 +163,10 @@ export function childrenToReact(context, node) {
  */
 function toReact(context, node, index, parent) {
   const options = context.options
+  const transform =
+    options.transformLinkUri === undefined
+      ? uriTransformer
+      : options.transformLinkUri
   const parentSchema = context.schema
   /** @type {ReactMarkdownNames} */
   // @ts-expect-error assume a known HTML/SVG element.
@@ -234,8 +239,8 @@ function toReact(context, node, index, parent) {
         : options.linkTarget
   }
 
-  if (name === 'a' && options.transformLinkUri) {
-    properties.href = options.transformLinkUri(
+  if (name === 'a' && transform) {
+    properties.href = transform(
       String(properties.href || ''),
       node.children,
       typeof properties.title === 'string' ? properties.title : null
diff --git a/lib/react-markdown.js b/lib/react-markdown.js
index d0760619..92a032c7 100644
--- a/lib/react-markdown.js
+++ b/lib/react-markdown.js
@@ -32,7 +32,6 @@ import remarkRehype from 'remark-rehype'
 import PropTypes from 'prop-types'
 import {html} from 'property-information'
 import rehypeFilter from './rehype-filter.js'
-import {uriTransformer} from './uri-transformer.js'
 import {childrenToReact} from './ast-to-react.js'
 
 const own = {}.hasOwnProperty
@@ -124,8 +123,6 @@ export function ReactMarkdown(options) {
   return result
 }
 
-ReactMarkdown.defaultProps = {transformLinkUri: uriTransformer}
-
 ReactMarkdown.propTypes = {
   // Core options:
   children: PropTypes.string,