diff --git a/trytond/ir/ui/form.rnc b/trytond/ir/ui/form.rnc
index c9c0be752f..ebd75eda8d 100644
--- a/trytond/ir/ui/form.rnc
+++ b/trytond/ir/ui/form.rnc
@@ -125,6 +125,8 @@ attlist.field &=
   }?
 attlist.field &= attribute spell { text }?
 attlist.field &= attribute float_time { text }?
+attlist.field &= attribute img_width { text }?
+attlist.field &= attribute img_height { text }?
 image = element image { attlist.image, empty }
 attlist.image &= attribute name { text }
 attlist.image &= [ a:defaultValue = "1" ] attribute colspan { text }?
diff --git a/trytond/ir/ui/form.rng b/trytond/ir/ui/form.rng
index 58922b6031..6f6ae72e0a 100644
--- a/trytond/ir/ui/form.rng
+++ b/trytond/ir/ui/form.rng
@@ -458,6 +458,16 @@
       <empty/>
     </element>
   </define>
+  <define name="attlist.field" combine="interleave">
+    <optional>
+      <attribute name="img_width"/>
+    </optional>
+  </define>
+  <define name="attlist.field" combine="interleave">
+    <optional>
+      <attribute name="img_height"/>
+    </optional>
+  </define>
   <define name="attlist.image" combine="interleave">
     <attribute name="name"/>
   </define>