diff --git a/wp-content/themes/twentythirteen/js/functions.js b/wp-content/themes/twentythirteen/js/functions.js
index a1fe7d755a..45b81b80bb 100644
--- a/wp-content/themes/twentythirteen/js/functions.js
+++ b/wp-content/themes/twentythirteen/js/functions.js
@@ -29,7 +29,7 @@
 		if ( navbarOffset < 0 )
 			navbarOffset = navbar.offset().top - toolbarOffset;
 
-		if ( window.scrollY >= navbarOffset )
+		if ( window.scrollY >= navbarOffset && 644 < window.innerWidth )
 			html.addClass( 'navbar-fixed' );
 		else
 			html.removeClass( 'navbar-fixed' );
diff --git a/wp-content/themes/twentythirteen/style.css b/wp-content/themes/twentythirteen/style.css
index 737490ab85..af35e40bb9 100644
--- a/wp-content/themes/twentythirteen/style.css
+++ b/wp-content/themes/twentythirteen/style.css
@@ -2833,16 +2833,6 @@ footer.entry-meta {
 		font-size: 30px;
 	}
 
-	.navbar-fixed .site-title,
-	.site-description {
-		font-size: 18px;
-	}
-
-	.navbar-fixed .site-title {
-		line-height: 2.5;
-		max-width: 220px;
-	}
-
 	#content .entry-header,
 	#content .entry-content,
 	#content .entry-summary,
@@ -2899,11 +2889,6 @@ footer.entry-meta {
 		width: 100%;
 	}
 
-	.navbar-fixed .toggled-on .nav-menu,
-	.navbar-fixed .toggled-on .nav-menu > ul {
-		display: none;
-	}
-
 	.toggled-on li,
 	.toggled-on .children {
 		display: block;