diff --git a/Makefile b/Makefile
index e9d2a46..b1c3c61 100644
--- a/Makefile
+++ b/Makefile
@@ -9,13 +9,15 @@ PDFS=$(patsubst %.tex,%.pdf,$(SOURCES))
 all: ${PDFS} README.md
 
 
-%.pdf: %.tex $(wildcard %-*.tex) dec.cls decsectional.cls
-	pdflatex ${basename $@ .pdf} < /dev/null
-	pdflatex ${basename $@ .pdf} < /dev/null
-
 watch:
 	ls *.tex *.cls | entr -c -s 'make'
 
 
 README.md: README.tex
 	pandoc -s README.tex -o README.md
+
+.SECONDEXPANSION:
+%.pdf: %.tex $$(wildcard %-*.tex) dec.cls decsectional.cls
+	pdflatex ${basename $@ .pdf} < /dev/null
+	pdflatex ${basename $@ .pdf} < /dev/null
+