diff --git a/docs/fileformats.html b/docs/fileformats.html
index efeabb0110f..c8d252db752 100644
--- a/docs/fileformats.html
+++ b/docs/fileformats.html
@@ -451,7 +451,7 @@
                     64-bit unsigned integers are written as eight
                     bytes, high-order bytes first.
                 </p>
-                                                <p>UInt32    --&gt; &lt;Byte&gt;<sup>8</sup>
+                                                <p>UInt64    --&gt; &lt;Byte&gt;<sup>8</sup>
                 </p>
                             </blockquote>
       </td></tr>
diff --git a/xdocs/fileformats.xml b/xdocs/fileformats.xml
index 9cfb16cde41..579ad4bfcac 100644
--- a/xdocs/fileformats.xml
+++ b/xdocs/fileformats.xml
@@ -283,7 +283,7 @@
                     bytes, high-order bytes first.
                 </p>
 
-                <p>UInt32    --&gt; &lt;Byte&gt;<sup>8</sup>
+                <p>UInt64    --&gt; &lt;Byte&gt;<sup>8</sup>
                 </p>
 
             </subsection>