diff --git a/data/theme/gdm.css b/data/theme/gdm.css
index ea58fc94c..417f8addf 100644
--- a/data/theme/gdm.css
+++ b/data/theme/gdm.css
@@ -110,6 +110,7 @@
     background-color: white;
     caret-color: black;
     caret-size: 1px;
+    width: 23em;
 }
 
 .login-dialog-session-list {