diff --git a/wp-admin/includes/dashboard.php b/wp-admin/includes/dashboard.php
index 9547f8f92..169923ff8 100644
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -1042,7 +1042,7 @@ function wp_dashboard_cached_rss_widget( $widget_id, $callback, $check_urls = ar
 		$check_urls = array( $widgets[$widget_id]['url'] );
 	}
 
-	$cache_key = 'dash_' . $widget_id;
+	$cache_key = 'dash_' . md5( $widget_id );
 	if ( false !== ( $output = get_transient( $cache_key ) ) ) {
 		echo $output;
 		return true;
@@ -1118,7 +1118,7 @@ function wp_dashboard_rss_control( $widget_id, $form_inputs = array() ) {
 			}
 		}
 		update_option( 'dashboard_widget_options', $widget_options );
-		$cache_key = 'dash_' . $widget_id;
+		$cache_key = 'dash_' . md5( $widget_id );
 		delete_transient( $cache_key );
 	}