diff --git a/virtualbox-guest-additions.spec b/virtualbox-guest-additions.spec
index c1b44d8..3f830f7 100644
--- a/virtualbox-guest-additions.spec
+++ b/virtualbox-guest-additions.spec
@@ -24,6 +24,8 @@ Patch4:     VirtualBox-5.2.6-gcc8.patch
 
 BuildRequires:  kBuild >= 0.1.9998
 BuildRequires:  desktop-file-utils
+# for xsltproc
+BuildRequires:  libxslt
 BuildRequires:  makeself
 BuildRequires:  yasm
 BuildRequires:  boost-devel