diff --git a/install.php b/install.php
index 7af007691..ccc5c0ddf 100644
--- a/install.php
+++ b/install.php
@@ -499,7 +499,7 @@ class e_install
 				<tr>
 					<td><label for='db'>".LANINS_027."</label></td>
 					<td class='form-inline'>
-						<input class='form-control input-large' type='text' name='db' size='20' id='db' value='".varset($this->previous_steps['mysql']['db'])."' maxlength='100' required='required' pattern='^[a-zA-Z0-9_-]*' />
+						<input class='form-control input-large' type='text' name='db' size='20' id='db' value='".varset($this->previous_steps['mysql']['db'])."' maxlength='100' required='required' pattern='^[a-z][a-zA-Z0-9_-]*' />
 						<label class='checkbox-inline'><input type='checkbox' name='createdb' value='1' ".($this->previous_steps['mysql']['createdb'] ==1 ? "checked='checked'" : "")." /><small>".LANINS_028."</small></label>
 						<span class='field-help'>".LANINS_033."</span>
 					</td>