diff --git a/Docker/lofar-base/Dockerfile.tmpl b/Docker/lofar-base/Dockerfile.tmpl
index 48151c3b8729361e37a043ac496d692c4ed66b3a..d117010a8453b67895bdc8c80fc6885b0ac7f4fe 100644
--- a/Docker/lofar-base/Dockerfile.tmpl
+++ b/Docker/lofar-base/Dockerfile.tmpl
@@ -43,7 +43,7 @@ RUN apt-get update && \
     apt-get install -y python-pip && \
     pip install numpy && \
     apt-get purge -y python-pip && \
-    apt-get autoremove && \
+    apt-get autoremove -y && \
     apt-get install -y nano
 
 #