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diff --git a/tools/svg2png.sh b/tools/svg2png.sh
index 62e8151..c539a3f 100755
--- a/tools/svg2png.sh
+++ b/tools/svg2png.sh
@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/bin/bash -xe
 
-for f in doc/source/images/*svg; do cairosvg ${f} -o ${f/\.svg/\.png} ; done
+find doc/source/ -name *svg | sed "s/\.svg$//" | xargs -I% cairosvg "%.svg" -o "%.png"
diff --git a/tox.ini b/tox.ini
index add75f9..27fdcea 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,11 @@ commands =
 commands = python setup.py build_sphinx
 
 [testenv:svg2png]
-deps = cairosvg
+deps =
+    cairosvg
+    lxml
+    tinycss
+    cssselect
 whitelist_externals = bash
 commands = bash tools/svg2png.sh