diff --git a/ubuntu-18.04/Dockerfile b/ubuntu-18.04/Dockerfile
index fbfa90ca4e2ec3a3385ff2c53fa648d662d9fcd6..075fa5e87ac8cb7362117b6bc880683e63c7b814 100644
--- a/ubuntu-18.04/Dockerfile
+++ b/ubuntu-18.04/Dockerfile
@@ -113,6 +113,7 @@ RUN cd /tmp && \
     rm -rf pybind11-2.2.3
 
 RUN apt-get install -y \
+        file \
         libepoxy-dev \
         libglm-dev \
         libegl1-mesa-dev \