diff --git a/.ci/monolithic-linux.sh b/.ci/monolithic-linux.sh
index 3ca4d05f4c891..5abb8d72df028 100755
--- a/.ci/monolithic-linux.sh
+++ b/.ci/monolithic-linux.sh
@@ -61,7 +61,8 @@ cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D LLDB_ENABLE_PYTHON=ON \
       -D LLDB_ENFORCE_STRICT_TEST_REQUIREMENTS=ON \
       -D CMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
-      -D CMAKE_EXE_LINKER_FLAGS="-no-pie"
+      -D CMAKE_EXE_LINKER_FLAGS="-no-pie" \
+      -D LLVM_ENABLE_WERROR=ON
 
 start-group "ninja"