diff --git a/library/compiler-builtins/.github/workflows/main.yml b/library/compiler-builtins/.github/workflows/main.yml
index 57497e050016..970a32ae5181 100644
--- a/library/compiler-builtins/.github/workflows/main.yml
+++ b/library/compiler-builtins/.github/workflows/main.yml
@@ -1,6 +1,10 @@
 name: CI
 on: [push, pull_request]
 
+env:
+  RUSTDOCFLAGS: -Dwarnings
+  RUSTFLAGS: -Dwarnings
+
 jobs:
   test:
     name: Test
diff --git a/library/compiler-builtins/ci/run-docker.sh b/library/compiler-builtins/ci/run-docker.sh
index b85f64133a71..e5ff8a46b26c 100755
--- a/library/compiler-builtins/ci/run-docker.sh
+++ b/library/compiler-builtins/ci/run-docker.sh
@@ -48,6 +48,7 @@ run() {
     docker run \
            --rm \
            -e RUST_COMPILER_RT_ROOT \
+           -e RUSTFLAGS \
            -e "CARGO_TARGET_DIR=/builtins-target" \
            -v "$(pwd):/checkout:ro" \
            -w /checkout \