diff --git a/src/wp-includes/ms-blogs.php b/src/wp-includes/ms-blogs.php
index d291f169db..83fec396ab 100644
--- a/src/wp-includes/ms-blogs.php
+++ b/src/wp-includes/ms-blogs.php
@@ -298,8 +298,7 @@ function update_blog_details( $blog_id, $details = array() ) {
 	$fields = array( 'site_id', 'domain', 'path', 'registered', 'last_updated', 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id');
 	foreach ( array_intersect( array_keys( $details ), $fields ) as $field ) {
 		if ( 'path' === $field ) {
-			$details[ $field ] = array_filter( explode( '/', $details[ $field ] ) );
-			$details[ $field ] = trailingslashit( '/' . implode( '/', $details[ $field ] ) );
+			$details[ $field ] = trailingslashit( '/' . trim( $details[ $field ], '/' ) );
 		}
 
 		$update_details[ $field ] = $details[ $field ];
diff --git a/tests/phpunit/tests/multisite/site.php b/tests/phpunit/tests/multisite/site.php
index 603546c3c7..3924e51905 100644
--- a/tests/phpunit/tests/multisite/site.php
+++ b/tests/phpunit/tests/multisite/site.php
@@ -591,10 +591,14 @@ class Tests_Multisite_Site extends WP_UnitTestCase {
 		$this->assertEquals( '/multiple/dirs/', $blog->path );
 	}
 
+	/**
+	 * `update_blog_details()` does not resolve multiple slashes in the
+	 * middle of a path string.
+	 */
 	function test_update_blog_details_multiple_paths_middle_slashes() {
 		update_blog_details( 1, array( 'path' => 'multiple///dirs' ) );
 		$blog = get_blog_details( 1 );
-		$this->assertEquals( '/multiple/dirs/', $blog->path );
+		$this->assertEquals( '/multiple///dirs/', $blog->path );
 	}
 
 	function test_update_blog_details_multiple_paths_leading_slash() {