diff --git a/rust/nix-util/src/settings.rs b/rust/nix-util/src/settings.rs
index 36964ad..b889f63 100644
--- a/rust/nix-util/src/settings.rs
+++ b/rust/nix-util/src/settings.rs
@@ -35,6 +35,7 @@ pub fn get(key: &str) -> Result<String> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use ctor::ctor;
 
     #[ctor::ctor]
     fn setup() {