diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c5c76856..cfec9334 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -219,7 +219,7 @@ armv7-debian-container_prep:
   stage: "Build and test"
   script:
     - cd "$BUILDDIR"
-    - meson --prefix="$PREFIX" -Dicon_directory=/usr/share/X11/icons ${MESON_BUILD_TYPE} ..
+    - meson --prefix="$PREFIX" -Dicon_directory=/usr/share/X11/icons -Dwerror=true ${MESON_BUILD_TYPE} ..
     - ninja -k0 -j${FDO_CI_CONCURRENT:-4}
     - meson test --num-processes ${FDO_CI_CONCURRENT:-4}
     - ninja clean