diff --git a/nixide-sys/build.rs b/nixide-sys/build.rs
index 59bd10e..19c9e23 100644
--- a/nixide-sys/build.rs
+++ b/nixide-sys/build.rs
@@ -137,6 +137,7 @@ fn main() {
         .file("libnixide-c/nixide_api_flake.cc")
         .file("libnixide-c/nixide_api_fetchers.cc")
         // .files(LIBS.iter().map(|s| (*s).strip_prefix("nix-").unwrap().strip_suffix("-c").unwrap()))
+        .opt_level((!cfg!(debug_assertions)) as u32 * 3)
         .includes(&include_paths)
         .compile("libnixide");