diff --git a/images/etherpad/Dockerfile b/images/etherpad/Dockerfile
index 675d640..e5d89fa 100644
--- a/images/etherpad/Dockerfile
+++ b/images/etherpad/Dockerfile
@@ -7,6 +7,8 @@ RUN install_packages git ca-certificates python3 make gcc
 
 RUN mkdir -p /srv && git clone --branch master https://github.com/ether/etherpad-lite.git /srv/etherpad
 
+ENV PYTHON /usr/bin/python3
+
 RUN cd /srv/etherpad \
 	&& npm install \
 	&& npm install sqlite3 \