diff --git a/codan/org.eclipse.cdt.codan.core/schema/checkers.exsd b/codan/org.eclipse.cdt.codan.core/schema/checkers.exsd
index 19901171a72..92a2ca56879 100644
--- a/codan/org.eclipse.cdt.codan.core/schema/checkers.exsd
+++ b/codan/org.eclipse.cdt.codan.core/schema/checkers.exsd
@@ -58,10 +58,7 @@
       </annotation>
       <complexType>
          <sequence minOccurs="0" maxOccurs="unbounded">
-            <choice>
-               <element ref="problem"/>
-               <element ref="problemRef"/>
-            </choice>
+            <element ref="problem"/>
          </sequence>
          <attribute name="id" type="string" use="required">
             <annotation>
@@ -216,21 +213,6 @@
       </complexType>
    </element>
 
-   <element name="problemRef">
-      <complexType>
-         <attribute name="problem" type="string" use="required">
-            <annotation>
-               <documentation>
-                  Reference to a problem
-               </documentation>
-               <appinfo>
-                  <meta.attribute kind="identifier" basedOn="org.eclipse.cdt.codan.core.checkers/checker/problem/@id"/>
-               </appinfo>
-            </annotation>
-         </attribute>
-      </complexType>
-   </element>
-
    <annotation>
       <appinfo>
          <meta.section type="since"/>