diff --git a/src/docs/asciidoc/prob_handbook.adoc b/src/docs/asciidoc/prob_handbook.adoc
index edf3a7d6c1f424481eaceeec293e36139338d2d2..b4eb4dcaecc771bbb810c3c56d2df086eee55a9c 100644
--- a/src/docs/asciidoc/prob_handbook.adoc
+++ b/src/docs/asciidoc/prob_handbook.adoc
@@ -3,7 +3,6 @@ Jens Bendisposto;Joy Clark;Michael Leuschel
 :bibtex-file: combined.bib
 :coderay-linenums-mode: table
 :doctype: book
-:encoding: utf-8
 :icon: font
 :imagesdir: images
 :linkattrs: