diff --git a/.drone.yml b/.drone.yml
index bf96efc..a80eeaf 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -83,7 +83,7 @@ steps:
   image: debian:buster-slim
   pull: always
   environment:
-    CXX: clang++
+    CXX: clang++-6
     CXXFLAGS: -pipe -O2
     LANG: en_US.utf-8
   commands: