diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index fbf1d0eca..465babc81 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -12,7 +12,7 @@ Antoine Levy-Lambert
 Anton Mazkovoi
 Arnaud Vandyck
 Arnout J. Kuiper
-Aslak Helles�y
+Aslak Hellesôy
 Atsuhiko Yamanaka
 Avik Sengupta
 Balazs Fejes 2
@@ -48,7 +48,7 @@ Dave Brondsema
 Dave Brosius
 David A. Herman
 David Crossley
-David G�rtner
+David Gärtner
 David Kavanagh
 David Maclean
 David Rees
@@ -91,7 +91,7 @@ Irene Rusman
 Ivan Ivanov
 Jack J. Woehr
 James Duncan Davidson
-Jan Mat�rne
+Jan Matèrne
 Jan Mynarik
 Jason Hunter
 Jason Pettiss
diff --git a/contributors.xml b/contributors.xml
index 37c9062f9..b6c74cf0b 100644
--- a/contributors.xml
+++ b/contributors.xml
@@ -58,7 +58,7 @@
   </name>
   <name>
     <first>Aslak</first>
-    <last>Helles&ocirc;y</last>
+    <last>Helles&#244;y</last>
   </name>
   <name>
     <first>Atsuhiko</first>
@@ -205,7 +205,7 @@
   </name>
   <name>
     <first>David</first>
-    <last>G&auml;rtner</last>
+    <last>G&#228;rtner</last>
   </name>
   <name>
     <first>David</first>
@@ -372,7 +372,7 @@
   </name>
   <name>
     <first>Jan</first>
-    <last>Mat&egrave;rne</last>
+    <last>Mat&#232;rne</last>
   </name>
   <name>
     <first>Jan</first>
@@ -701,6 +701,7 @@
   <name>
     <first>&#216;ystein</first>
     <last>Gisn&#229;s</last>
+  </name>
   <name>
     <first>Patrick</first>
     <last>C.</last>