diff --git a/Dockerfile b/Dockerfile
index 913ef92..e51f537 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,4 +3,4 @@ ARG SEEDER_VERSION
 ENV SEEDER_VERSION=${SEEDER_VERSION}
 
 COPY . /tmp/seeder
-RUN (cd /tmp/seeder && bin/waf configure install --notests --prefix=$VIRTUAL_ENV) && rm -rf /tmp/seeder
+RUN (source $VIRTUAL_ENV/bin/activate && cd /tmp/seeder && bin/waf configure install --notests --prefix=$VIRTUAL_ENV) && rm -rf /tmp/seeder