diff --git a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
index 9bca7421f3..7196529f73 100644
--- a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
+++ b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
@@ -3400,7 +3400,7 @@
     </listitem>
 
     <listitem>
-      <para>Grün Christian-Rolf
+      <para>Gr&uuml;n Christian-Rolf
 	<email>kiki@bsdro.org</email></para>
     </listitem>
 
@@ -9809,7 +9809,7 @@
     </listitem>
 
     <listitem>
-      <para>Ulrich Spörlein
+      <para>Ulrich Sp&ouml;rlein
 	<email>uspoerlein@gmail.com</email></para>
     </listitem>