diff --git a/src/wp-includes/canonical.php b/src/wp-includes/canonical.php
index a799c5c2d36f..2d776e870773 100644
--- a/src/wp-includes/canonical.php
+++ b/src/wp-includes/canonical.php
@@ -57,8 +57,8 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		}
 	}
 
-	if ( is_admin() || is_search() || is_preview() || is_trackback()
-		|| is_favicon() || ( $is_IIS && ! iis7_supports_permalinks() )
+	if ( is_admin() || is_search() || is_preview() || is_trackback() || is_favicon()
+		|| ( $is_IIS && ! iis7_supports_permalinks() )
 	) {
 		return;
 	}
@@ -655,8 +655,10 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		$redirect['path'] = trailingslashit( $redirect['path'] );
 	}
 
-	// Remove trailing slash for sitemaps requests.
-	if ( ! empty( get_query_var( 'sitemap' ) ) || ! empty( get_query_var( 'sitemap-stylesheet' ) ) ) {
+	// Remove trailing slash for robots.txt or sitemap requests.
+	if ( is_robots()
+		|| ! empty( get_query_var( 'sitemap' ) ) || ! empty( get_query_var( 'sitemap-stylesheet' ) )
+	) {
 		$redirect['path'] = untrailingslashit( $redirect['path'] );
 	}
 
@@ -682,11 +684,6 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		$redirect['host'] = $original['host'];
 	}
 
-	// Even if the permalink structure ends with a slash, remove slash robots.txt.
-	if ( is_robots() ) {
-		$redirect['path'] = untrailingslashit( $redirect['path'] );
-	}
-
 	$compare_original = array( $original['host'], $original['path'] );
 
 	if ( ! empty( $original['port'] ) ) {
diff --git a/tests/phpunit/tests/canonical/robots.php b/tests/phpunit/tests/canonical/robots.php
index e9cd45effcab..c7851a062ee1 100644
--- a/tests/phpunit/tests/canonical/robots.php
+++ b/tests/phpunit/tests/canonical/robots.php
@@ -7,12 +7,8 @@
  */
 class Tests_Canonical_Robots extends WP_Canonical_UnitTestCase {
 
-	function setUp() {
-		parent::setUp();
-	}
-
-	function test_robots_url() {
-		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
+	public function test_remove_trailing_slashes_for_robots_requests() {
+		$this->set_permalink_structure( '/%postname%/' );
 		$this->assertCanonical( '/robots.txt', '/robots.txt' );
 		$this->assertCanonical( '/robots.txt/', '/robots.txt' );
 	}
diff --git a/tests/phpunit/tests/canonical/sitemaps.php b/tests/phpunit/tests/canonical/sitemaps.php
index 579247a33cd2..dd0bdfbdb645 100644
--- a/tests/phpunit/tests/canonical/sitemaps.php
+++ b/tests/phpunit/tests/canonical/sitemaps.php
@@ -7,6 +7,7 @@
  * @group sitemaps
  */
 class Tests_Canonical_Sitemaps extends WP_Canonical_UnitTestCase {
+
 	public function setUp() {
 		parent::setUp();
 		$wp_sitemaps = new WP_Sitemaps();
@@ -38,4 +39,5 @@ public function test_remove_trailing_slashes_for_sitemap_stylesheet_requests() {
 		$this->assertCanonical( '/wp-sitemap.xsl', '/wp-sitemap.xsl' );
 		$this->assertCanonical( '/wp-sitemap.xsl/', '/wp-sitemap.xsl' );
 	}
+
 }