diff --git a/src/option.rs b/src/option.rs
index fdddc81..a688509 100644
--- a/src/option.rs
+++ b/src/option.rs
@@ -79,7 +79,7 @@ impl<T: From<U>, U> core::ops::FromResidual<U> for TransposedOption<T> {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "transposed-option"))]
 mod tests {
     use super::*;
     use TransposedOption::*;