diff --git a/.drone.yml b/.drone.yml
index 0c98df4..dea384f 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -31,6 +31,7 @@ steps:
 #   environment:
 #     CXX: g++-8
 #     CXXFLAGS: -pipe -O2
+#     DEBIAN_FRONTEND: noninteractive
 #     LANG: C.utf8
 #   commands:
 #   - rm /etc/apt/apt.conf.d/docker-clean
@@ -57,6 +58,7 @@ steps:
   environment:
     CXX: g++-7
     CXXFLAGS: -pipe -O2
+    DEBIAN_FRONTEND: noninteractive
     LANG: C.utf8
   commands:
   - rm /etc/apt/apt.conf.d/docker-clean