diff --git a/concrete-optimizer/build.rs b/concrete-optimizer/build.rs
index 041d3a7f4..9cc6223df 100644
--- a/concrete-optimizer/build.rs
+++ b/concrete-optimizer/build.rs
@@ -7,7 +7,7 @@ fn main() {
     let package_name = env::var("CARGO_PKG_NAME").unwrap();
     let target_dir = match env::var("CARGO_TARGET_DIR") {
         Ok(target) => PathBuf::from(target),
-        _ => PathBuf::from(crate_dir.clone()).join("target"),
+        _ => PathBuf::from(crate_dir.clone()).join("../target"),
     };
 
     let header_name = format!("{}.h", package_name);