diff --git a/Makefile b/Makefile
index 7e7ba1e..033bd73 100644
--- a/Makefile
+++ b/Makefile
@@ -15,16 +15,16 @@ aux = coope.aux
 default: pdf
 
 pdf: $(sec)
-	pdflatex $(src)
+	pdflatex -shell-escape $(src)
 	bibtex $(aux)
-	pdflatex $(src)
-	pdflatex $(src)
+	pdflatex -shell-escape $(src)
+	pdflatex -shell-escape $(src)
 
 dvi: $(sec)
-	latex $(src)
+	latex -shell-escape $(src)
 	bibtex $(aux)
-	latex $(src)
-	latex $(src)
+	latex -shell-escape $(src)
+	latex -shell-escape $(src)
 
 clean:
 	rm -f coope.{pdf,dvi}