diff --git a/src/wp-includes/theme.php b/src/wp-includes/theme.php
index 07b0f6a208..130b90e645 100644
--- a/src/wp-includes/theme.php
+++ b/src/wp-includes/theme.php
@@ -1888,6 +1888,7 @@ function check_theme_switched() {
 			/** This action is documented in wp-includes/theme.php */
 			do_action( 'after_switch_theme', $stylesheet );
 		}
+		flush_rewrite_rules();
 
 		update_option( 'theme_switched', false );
 	}