diff --git a/resources/schema/inventory.xsd b/resources/schema/inventory.xsd
index 38e3906..88b0565 100644
--- a/resources/schema/inventory.xsd
+++ b/resources/schema/inventory.xsd
@@ -103,7 +103,6 @@
       <xsd:extension base="xsd:decimal">
         <xsd:attribute name="type" type="xsd:string" use="required"/>
         <xsd:attribute name="source" type="xsd:string"/>
-        <xsd:attribute name="ratio_base" type="xsd:int"/>
       </xsd:extension>
     </xsd:simpleContent>
   </xsd:complexType>