diff --git a/paper.bib b/paper.bib
index f2fad9c..58995ba 100644
--- a/paper.bib
+++ b/paper.bib
@@ -208,7 +208,7 @@ @ARTICLE{Kolditz2012
   number    =  {2},
   pages     = {"589--599"},
   year      =  {2012},
-  doi       = {10.1007/s12665-012-1546},
+  doi       = {10.1007/s12665-012-1546-x},
 }
 
 @ARTICLE{Kolditz2016,