diff --git a/test/utils/docker/ubuntu1204/Dockerfile b/test/utils/docker/ubuntu1204/Dockerfile
index 181d0ed36a..cd15475d48 100644
--- a/test/utils/docker/ubuntu1204/Dockerfile
+++ b/test/utils/docker/ubuntu1204/Dockerfile
@@ -8,6 +8,7 @@ RUN apt-get install -y \
     make \
     mercurial \
     ruby \
+    rubygems \
     subversion \
     sudo \
     unzip