diff --git a/teckidscal.sty b/teckidscal.sty
index 35df5621bf8d771eafcaeb29d938ad1624007e64..c38c9acdae5efdf0321730b3b95682ea25c09890 100644
--- a/teckidscal.sty
+++ b/teckidscal.sty
@@ -142,7 +142,7 @@
  \ifnum\@tempcnta<\@tempcntb%
  \advance\@tempcnta by 1\repeat%
  %% 500. Jahrestag der Reformation (31.10.2017)
- \tk@mkholiday{2017-01-01}{500. Jahrestag der Reformation}%
+ \tk@mkholiday{2017-10-31}{500. Jahrestag der Reformation}%
 }%
 
 \def\tk@BoldenDay{%