diff --git a/docker/Dockerfile.build.ubuntu20 b/docker/Dockerfile.build.ubuntu20
index 71025d3bab..fd4de7c22a 100644
--- a/docker/Dockerfile.build.ubuntu20
+++ b/docker/Dockerfile.build.ubuntu20
@@ -35,4 +35,4 @@ COPY . .
 RUN /bin/sh oaienv && \
     cd cmake_targets && \
     mkdir -p log && \
-    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope nrqtscope" -w USRP --verbose-ci --noavx512 -c
+    ./build_oai --eNB --gNB --RU --UE --nrUE --ninja --build-lib "telnetsrv enbscope uescope nrscope nrqtscope" -w USRP --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror