diff --git a/wp-includes/ms-blogs.php b/wp-includes/ms-blogs.php
index e1c70e1a8d..72ebbaa3a8 100644
--- a/wp-includes/ms-blogs.php
+++ b/wp-includes/ms-blogs.php
@@ -296,8 +296,14 @@ function update_blog_details( $blog_id, $details = array() ) {
 
 	$update_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 )
-		$update_details[$field] = $details[$field];
+	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 ] ) );
+		}
+
+		$update_details[ $field ] = $details[ $field ];
+	}
 
 	$result = $wpdb->update( $wpdb->blogs, $update_details, array('blog_id' => $blog_id) );
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8dfe0f24e1..4e90c73e79 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31154';
+$wp_version = '4.2-alpha-31155';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.