diff --git a/.gitignore b/.gitignore
index bbaaa01..fa12266 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+demo.pdf
+
 *.acn
 *.acr
 *.alg
diff --git a/Makefile b/Makefile
index ad99b3c..9728289 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,16 @@
 SRC = demo.tex
 PDF = demo.pdf
+AUX = demo.aux
 TEXC := xelatex
 
 .PHONY: clean
 
-$(PDF): $(SRC)
+all: $(PDF)
+
+$(AUX):
+	$(TEXC) $(SRC)
+
+$(PDF): $(AUX) $(SRC)
 	$(TEXC) $(SRC)
 
 clean: