diff --git a/sections/login/login.php b/sections/login/login.php
index 3678939a..d46eb426 100644
--- a/sections/login/login.php
+++ b/sections/login/login.php
@@ -26,7 +26,7 @@
 		<tr>
 			<td>Username&nbsp;</td>
 			<td colspan="2">
-				<input type="text" name="username" id="username" class="inputtext" required="required" maxlength="20" pattern="[A-Za-z0-9_?]{1,20}" autofocus="autofocus" placeholder="Username" />
+				<input type="text" name="username" id="username" class="inputtext" required="required" maxlength="20" pattern="[A-Za-z0-9_?\.]{1,20}" autofocus="autofocus" placeholder="Username" />
 			</td>
 		</tr>
 		<tr>