diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index e8e936cbc4..8a3a71cd6c 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -878,6 +878,10 @@ function get_custom_logo( $blog_id = 0 ) {
 	$custom_logo_id = get_theme_mod( 'custom_logo' );
 	$size           = get_theme_support( 'custom-logo', 'size' );
 
+	if ( ! $size ) {
+		$size = 'full';
+	}
+
 	// We have a logo. Logo is go.
 	if ( $custom_logo_id ) {
 		$html = sprintf( '<a href="%1$s" class="custom-logo-link" rel="home" itemprop="url">%2$s</a>',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index e4916026e5..53f4660ca7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-beta3-36949';
+$wp_version = '4.5-beta3-36950';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.