diff --git a/.cirrus.yml b/.cirrus.yml
index f287d23c5b..b50da72eec 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -12,7 +12,7 @@ freebsd_12_task:
   script:
     - mkdir build
     - cd build
-    - ../configure || { cat config.log; exit 1; }
+    - ../configure --enable-werror || { cat config.log; exit 1; }
     - gmake -j8
     - gmake V=1 check