diff --git a/examplebroker/com.ubuntu.auth.ExampleBroker.xml b/examplebroker/com.ubuntu.auth.ExampleBroker.xml
index 6bdc0792ca..a47e3620b1 100644
--- a/examplebroker/com.ubuntu.auth.ExampleBroker.xml
+++ b/examplebroker/com.ubuntu.auth.ExampleBroker.xml
@@ -17,13 +17,13 @@
     </method>
     <method name="GetAuthenticationModes">
       <arg type="s" direction="in" name="sessionID"/>
-      <arg type="a{s}s" direction="in" name="supportedUILayouts"/>
-      <arg type="a{s}s" direction="out" name="authenticationModes"/>
+      <arg type="a{ss}" direction="in" name="supportedUILayouts"/>
+      <arg type="a{ss}" direction="out" name="authenticationModes"/>
     </method>
     <method name="SelectAuthenticationMode">
         <arg type="s" direction="in" name="sessionID"/>
         <arg type="s" direction="in" name="authenticationModeName"/>
-        <arg type="a{s}s" direction="out"  name="uiLayoutInfo"/>
+        <arg type="a{ss}" direction="out"  name="uiLayoutInfo"/>
     </method>
     <method name="IsAuthenticated">
         <arg type="s" direction="in" name="sessionID"/>