diff --git a/Dockerfile b/Dockerfile
index b615f62f..35ed96b0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-suggests --no-install-reco
   && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
   && echo "LANG=en_US.UTF-8" > /etc/locale.conf \
   && locale-gen en_US.UTF-8 \
-  && apt-get remove locales && apt-get auto-remove \
+  && apt-get remove -y locales && apt-get auto-remove -y \
   && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 ENV PYTHONIOENCODING=utf-8