diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3f84f67..2430078 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,7 @@
 debian:
     image: debian:stable-slim
     before_script:
+        - apt-get -qq update
         - apt-get -qq install make clang
     script:
         - make
@@ -8,6 +9,6 @@ debian:
 alpine:
     image: alpine:latest
     before_script:
-        - apk add make clang
+        - apk add make clang linux-headers
     script:
         - make