diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index 520d89bf01..00d1e0c098 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -4428,11 +4428,12 @@ function _page_traverse_name( $page_id, &$children, &$result ){
  * Sub pages will be in the "directory" under the parent page post name.
  *
  * @since 1.5.0
+ * @since 4.6.0 The $page parameter is optional.
  *
- * @param WP_Post|object|int $page Page object or page ID.
+ * @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
  * @return string|false Page URI, false on error.
  */
-function get_page_uri( $page ) {
+function get_page_uri( $page = 0 ) {
 	if ( ! $page instanceof WP_Post ) {
 		$page = get_post( $page );
 	}
diff --git a/tests/phpunit/tests/post/getPageUri.php b/tests/phpunit/tests/post/getPageUri.php
new file mode 100644
index 0000000000..604dd20f79
--- /dev/null
+++ b/tests/phpunit/tests/post/getPageUri.php
@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * @group post
+ */
+class Tests_Post_getPageUri extends WP_UnitTestCase {
+
+	function test_get_page_uri_without_argument() {
+		$post_id = self::factory()->post->create(array(
+			'post_title' => 'Blood Orange announces summer tour dates',
+			'post_name' => 'blood-orange-announces-summer-tour-dates',
+		));
+		$post = get_post( $post_id );
+		$this->go_to( get_permalink( $post_id ) );
+		$this->assertEquals( 'blood-orange-announces-summer-tour-dates', get_page_uri() );
+	}
+}