diff --git a/doc/Makefile.am b/doc/Makefile.am
index 9ad867af8543ce04e45795993f7b443ca8b988c3..bfe48efd272913c0c827a048720d9c930e8c069b 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -3,8 +3,8 @@ docfiles = kpp_UserManual.pdf
 if HAVE_PDFLATEX
 docfiles +=  boxmox_UserManual.pdf
 boxmox_UserManual.pdf : boxmox_UserManual.tex
-	@pdflatex@ $<
-	@pdflatex@ $<
+	@PDFLATEX@ $<
+	@PDFLATEX@ $<
 
 clean-local:
 	rm -f *.log *.out *.toc *.aux boxmox_UserManual.pdf