diff --git a/build_tools/ci/build_posix.sh b/build_tools/ci/build_posix.sh
index fec5e252e..6a615f92b 100755
--- a/build_tools/ci/build_posix.sh
+++ b/build_tools/ci/build_posix.sh
@@ -42,7 +42,7 @@ cmake -S "$repo_root/externals/llvm-project/llvm" -B "$build_dir" \
   -DCMAKE_BUILD_TYPE=Release \
   -DPython3_EXECUTABLE="$(which python)" \
   -DLLVM_ENABLE_ASSERTIONS=ON \
-  -DTORCH_MLIR_ENABLE_WERROR_FLAG=ON \
+  -DTORCH_MLIR_ENABLE_WERROR_FLAG=OFF \
   -DCMAKE_INSTALL_PREFIX="$install_dir" \
   -DCMAKE_INSTALL_LIBDIR=lib \
   -DLLVM_ENABLE_PROJECTS=mlir \