diff --git a/slides/makefile b/slides/makefile
index 1d34b35..4c91bc6 100644
--- a/slides/makefile
+++ b/slides/makefile
@@ -3,6 +3,7 @@ slides = $(shell find sections/ -name "*.md" | sort -V)
 pandoc = \
   @ pandoc $1          \
   --pdf-engine xelatex \
+	-F pandoc-citeproc   \
   -t beamer            \
   -o $2