diff --git a/Makefile b/Makefile
index 9445a16..1734dea 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,8 @@ all: machines.pdf
 	evince $<
 
 machines.pdf: machines.tex
+	pdflatex $<
+	bibtex $(basename $<)
 	pdflatex $<
 	pdflatex $<