diff --git a/kicad.spec b/kicad.spec
index 7fc5416..e96bd55 100644
--- a/kicad.spec
+++ b/kicad.spec
@@ -109,6 +109,7 @@ BuildRequires:	pkgconfig(glu)
 BuildRequires:	pkgconfig(openssl)
 BuildRequires:	pkgconfig(python)
 # doc
+BuildRequires:	a2x
 BuildRequires:	asciidoc
 BuildRequires:	dblatex
 BuildRequires:	git