diff --git a/css/custom.css b/css/custom.css
index cdf6a6b4..89cb61f1 100644
--- a/css/custom.css
+++ b/css/custom.css
@@ -5,7 +5,7 @@
 }
 
 /* Make links and long strings responsive */
-a, long-string-list li {
+a, .long-string-list li {
   word-wrap: break-word;
   max-width: 300px;
 }