diff --git a/debian/gitlab-ci.yml b/debian/gitlab-ci.yml
index a3e367ecbfbb2a115eadb400a20644f83db92718..0ca4ddeaa44cb53f9de9d2f7d817d663bdc44e69 100644
--- a/debian/gitlab-ci.yml
+++ b/debian/gitlab-ci.yml
@@ -49,6 +49,15 @@ ubsan:
                 clang-tools \
                 ${NULL+}
 
+            rm -fr builddir
+            meson \
+                -Db_lundef=false \
+                -Db_sanitize=address,undefined \
+                --werror \
+                builddir
+            ninja -C builddir
+            meson test -C builddir -v
+
             export CC=clang
             export CXX=clang++