diff --git a/Dockerfile b/Dockerfile
index a51d2ca..9f80f39 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,7 @@
 from ubuntu:18.04
 
 # Install prerequisites
-env DEBIAN_FRONTEND=noninteractive
-run apt-get update && apt-get install -y \
+run apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     build-essential \
     cmake \
     curl \