diff --git a/tests/aux/build-and-test.sh b/tests/aux/build-and-test.sh
index a63b8e3..101f7a5 100755
--- a/tests/aux/build-and-test.sh
+++ b/tests/aux/build-and-test.sh
@@ -13,6 +13,7 @@ else
     brew install pkg-config
     brew install libtool
     brew install asciidoc
+    brew install docbook-xsl
     brew install libyubikey
     brew install ykclient
     brew install ykpers