diff --git a/make/tex.mk b/make/tex.mk
index e89ce577..a5758a4e 100644
--- a/make/tex.mk
+++ b/make/tex.mk
@@ -273,7 +273,7 @@ $(OUT).html.zip: $(HTMLDIR)
 $(OUTPUT).pdf: $(GENERATED)
 	@echo "-- creating pdf file"
 	# for i in 1 2 3 ; do echo "============================ pass $$i"; pdflatex $(MAIN).tex 2>&1 | grep -ve "Underfull\|Overfull"| grep .;  done
-	for i in 1 2 3 ; do echo "============================ pass $$i"; pdflatex $(MAIN).tex;  done
+	for i in 1 2 3 ; do echo "============================ pass $$i"; pdflatex $(MAIN).tex || exit 1;  done
 	mv $(MAIN).pdf $(OUTPUT).pdf
 
 $(OUT).pdf.zip: $(OUTPUT).pdf