diff --git a/soziale-welt.csl b/soziale-welt.csl
index 62ce559c7b..6a7933b0cc 100644
--- a/soziale-welt.csl
+++ b/soziale-welt.csl
@@ -18,7 +18,7 @@
     <category field="social_science"/>
     <issn>0038-6073</issn>
     <summary>Stil für Soziale Welt (German)</summary>
-    <updated>2015-11-23T15:49:26+0100</updated>
+    <updated>2015-11-23T15:49:26+01:00</updated>
     <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
   </info>
   <macro name="editor">