diff --git a/library/compiler-builtins/libm/ci/run-docker.sh b/library/compiler-builtins/libm/ci/run-docker.sh
index a040126df845..d9f29656d713 100755
--- a/library/compiler-builtins/libm/ci/run-docker.sh
+++ b/library/compiler-builtins/libm/ci/run-docker.sh
@@ -28,6 +28,7 @@ run() {
     docker run \
         --rm \
         --user "$(id -u):$(id -g)" \
+        -e CI \
         -e RUSTFLAGS \
         -e CARGO_HOME=/cargo \
         -e CARGO_TARGET_DIR=/target \