diff --git a/firmware/faderboard/.cargo/config b/firmware/faderboard/.cargo/config.toml
similarity index 85%
rename from firmware/faderboard/.cargo/config
rename to firmware/faderboard/.cargo/config.toml
index 09114c0..0d296e0 100644
--- a/firmware/faderboard/.cargo/config
+++ b/firmware/faderboard/.cargo/config.toml
@@ -5,4 +5,5 @@ target = "thumbv6m-none-eabi"
 runner = "./flash.sh"
 rustflags = [
   "-C", "link-arg=-Tlink.x",
+  "-C", "opt-level=s",
 ]