diff --git a/containers/xos/Dockerfile.devel b/containers/xos/Dockerfile.devel
index ad85dd3..ebcb5c3 100644
--- a/containers/xos/Dockerfile.devel
+++ b/containers/xos/Dockerfile.devel
@@ -117,7 +117,7 @@
 ENV KEY_OU Development
 ENV KEY_NAME server
 RUN /opt/openvpn/clean-all
-RUN /opt/openvpn/build-ca --batch
+RUN env OPENSSL="openssl" /opt/openvpn/opt/openvpn/build-ca --batch
 RUN /opt/openvpn/build-key-server --batch server
 RUN /opt/openvpn/build-dh
 RUN chmod 777 /opt/openvpn/keys/server.key