diff --git a/src/lib/eZ/RichText/Resources/schemas/docbook/ezpublish.rng b/src/lib/eZ/RichText/Resources/schemas/docbook/ezpublish.rng
index ea3f1f7f..6a77e1d8 100644
--- a/src/lib/eZ/RichText/Resources/schemas/docbook/ezpublish.rng
+++ b/src/lib/eZ/RichText/Resources/schemas/docbook/ezpublish.rng
@@ -832,6 +832,30 @@
     </optional>
   </define>
 
+  <define name="db.html.th" combine="choice">
+    <element name="th">
+      <a:documentation>A table header entry in an HTML table</a:documentation>
+      <ref name="db.html.th.attlist"/>
+      <zeroOrMore>
+        <choice>
+          <ref name="db.all.inlines"/>
+          <ref name="db.all.blocks"/>
+        </choice>
+      </zeroOrMore>
+    </element>
+  </define>
+  <define name="db.html.td" combine="choice">
+    <element name="td">
+      <a:documentation>A table entry in an HTML table</a:documentation>
+      <zeroOrMore>
+        <choice>
+          <ref name="db.all.inlines"/>
+          <ref name="db.all.blocks"/>
+        </choice>
+      </zeroOrMore>
+    </element>
+  </define>
+
   <div>
     <a:documentation>
       Adding child ezattribute element to the selected elements.
diff --git a/tests/lib/eZ/RichText/Validator/DocbookTest.php b/tests/lib/eZ/RichText/Validator/DocbookTest.php
index bc2f6b77..a7f39b2f 100644
--- a/tests/lib/eZ/RichText/Validator/DocbookTest.php
+++ b/tests/lib/eZ/RichText/Validator/DocbookTest.php
@@ -111,6 +111,25 @@ public function providerForTestValidate()
             <emphasis role="strikedthrough">strikedthrough</emphasis>
         </subscript>
     </para>
+</section>',
+                [],
+            ],
+            [
+                '<?xml version="1.0" encoding="UTF-8"?>
+<section
+    xmlns="http://docbook.org/ns/docbook"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:ezxhtml="http://ez.no/xmlns/ezpublish/docbook/xhtml"
+    xmlns:ezcustom="http://ez.no/xmlns/ezpublish/docbook/custom" version="5.0-variant ezpublish-1.0">
+    <informaltable width="100%" border="1">
+        <tbody>
+            <tr>
+                <td>
+                    <blockquote/>
+                </td>
+            </tr>
+        </tbody>
+    </informaltable>
 </section>',
                 [],
             ],