diff --git a/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile b/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
index 70390c2ac1df1..a157fee16cfd5 100644
--- a/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-full-bootstrap/Dockerfile
@@ -20,3 +20,9 @@ ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
       --enable-full-bootstrap
 ENV SCRIPT python2.7 ../x.py build
+
+# In general this just slows down the build and we're just a smoke test that
+# a full bootstrap works in general, so there's not much need to take this
+# penalty in build times.
+ENV NO_LLVM_ASSERTIONS 1
+ENV NO_DEBUG_ASSERTIONS 1