diff --git a/administrator/components/com_patchtester/config.xml b/administrator/components/com_patchtester/config.xml
index 7cd17c8..f1e32f9 100644
--- a/administrator/components/com_patchtester/config.xml
+++ b/administrator/components/com_patchtester/config.xml
@@ -61,13 +61,14 @@
 			<option value="token">COM_PATCHTESTER_FIELD_GH_AUTH_OPTION_TOKEN</option>
 		</field>
 
+		<!-- Note: Default username is a space to avoid browser autocomplete, -->
 		<field
 			name="gh_user"
 			type="text"
 			label="COM_PATCHTESTER_FIELD_GH_USER_LABEL"
 			description="COM_PATCHTESTER_FIELD_GH_USER_DESC"
 			autocomplete="off"
-			default=""
+			default=" "
 			showon="gh_auth:credentials"
 		/>