diff --git a/chapter.mk b/chapter.mk
index cd6fe56..ec6fe68 100644
--- a/chapter.mk
+++ b/chapter.mk
@@ -34,8 +34,8 @@ chapter : $(BASENAME)-chapter.pdf
 
 $(BASENAME)-chapter.pdf : $(BASENAME)-chapter.tex $(BASENAME).tex $(wildcard $(BASENAME).aux) $(PYPDFFILES) $(GPTTEXFILES) ../../header.tex
 	if test -f $(BASENAME).aux; then \
-	  CHAPTER=$$(( $$(sed -n -e '/contentsline {chapter}/{s/.*numberline {\([0123456789]*\)}.*/\1/; p}' $(BASENAME).aux) - 1 )); \
-	  PAGE=$$(sed -n -e '/contentsline {chapter}/{s/.*numberline {.*}.*}{\(.*\)}{chapter.*/\1/; p}' $(BASENAME).aux); \
+	  CHAPTER=$$(( $$(sed -n -e '/contentsline {chapter}/{s/.*numberline {\([0123456789]*\)}.*/\1/; p; q}' $(BASENAME).aux) - 1 )); \
+	  PAGE=$$(sed -n -e '/contentsline {chapter}/{s/.*numberline {.*}.*}{\(.*\)}{chapter.*/\1/; p; q}' $(BASENAME).aux); \
 	fi; \
 	{ echo $${PAGE:=1}; echo $${CHAPTER:=0}; } | pdflatex -interaction=scrollmode $< | tee /dev/stderr | fgrep -q "Rerun to get cross-references right" && { echo $${PAGE:=1}; echo $${CHAPTER:=0}; } | pdflatex -interaction=scrollmode $< || true