diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index acfb1404..0c7c0530 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -1155,7 +1155,7 @@
 	a buffer that is larger (by a factor of scale in each dimension)
 	than the desired surface size.
       </description>
-      <arg name="scale" type="uint"/>
+      <arg name="scale" type="int"/>
     </request>
    </interface>
 
@@ -1652,7 +1652,7 @@
 	avoid scaling the surface, and the client can supply
 	a higher detail image.
       </description>
-      <arg name="factor" type="uint" summary="scaling factor of output"/>
+      <arg name="factor" type="int" summary="scaling factor of output"/>
     </event>
   </interface>