diff --git a/.github/actions/install-rust/main.js b/.github/actions/install-rust/main.js
index e408b3a8bc..f94596aa8e 100644
--- a/.github/actions/install-rust/main.js
+++ b/.github/actions/install-rust/main.js
@@ -12,4 +12,10 @@ child_process.execFileSync('rustup', ['set', 'profile', 'minimal']);
 child_process.execFileSync('rustup', ['update', toolchain, '--no-self-update']);
 child_process.execFileSync('rustup', ['default', toolchain]);
 
+// Save disk space by avoiding incremental compilation, and also we don't use
+// any caching so incremental wouldn't help anyway.
 console.log(`::set-env name=CARGO_INCREMENTAL::0`);
+
+// Turn down debuginfo from 2 to 1 to help save disk space
+console.log(`::set-env name=CARGO_PROFILE_DEV_DEBUG::1`);
+console.log(`::set-env name=CARGO_PROFILE_TEST_DEBUG::1`);