diff --git a/src/wp-admin/options-general.php b/src/wp-admin/options-general.php
index 65353325f0..f294600829 100644
--- a/src/wp-admin/options-general.php
+++ b/src/wp-admin/options-general.php
@@ -32,7 +32,7 @@ function options_general_add_js() {
 				$("input[name='date_format_custom']").val( $(this).val() ).siblings('.example').text( $(this).siblings('span').text() );
 		});
 		$("input[name='date_format_custom']").focus(function(){
-			$("#date_format_custom_radio").attr("checked", "checked");
+			$( '#date_format_custom_radio' ).prop( 'checked', true );
 		});
 
 		$("input[name='time_format']").click(function(){
@@ -40,7 +40,7 @@ function options_general_add_js() {
 				$("input[name='time_format_custom']").val( $(this).val() ).siblings('.example').text( $(this).siblings('span').text() );
 		});
 		$("input[name='time_format_custom']").focus(function(){
-			$("#time_format_custom_radio").attr("checked", "checked");
+			$( '#time_format_custom_radio' ).prop( 'checked', true );
 		});
 		$("input[name='date_format_custom'], input[name='time_format_custom']").change( function() {
 			var format = $(this);