diff --git a/src/options/level_tuning.rs b/src/options/level_tuning.rs
index c59f61c7..6619e09e 100644
--- a/src/options/level_tuning.rs
+++ b/src/options/level_tuning.rs
@@ -102,6 +102,7 @@ impl LevelTuning {
     }
 }
 
+#[cfg(test)]
 mod tests {
     use super::*;