diff --git a/header.php b/header.php
index ab69fcf..f93c894 100644
--- a/header.php
+++ b/header.php
@@ -55,7 +55,7 @@ $container = get_theme_mod( 'understrap_container_type' );
 						the_custom_logo();
 					} ?><!-- end custom logo -->
 
-				<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
+				<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="<?php esc_attr_e( 'Toggle navigation', 'understrap' ); ?>">
 					<span class="navbar-toggler-icon"></span>
 				</button>