diff --git a/output/src/ops.rs b/output/src/ops.rs
index b1a5786..a46f3f3 100644
--- a/output/src/ops.rs
+++ b/output/src/ops.rs
@@ -6,6 +6,7 @@ mod map;       pub use self::map::*;
 mod thunk;     pub use self::thunk::*;
 mod transform; pub use self::transform::*;
 
+#[cfg(test)] use crate::*;
 #[cfg(test)] #[test] fn test_ops () -> Usually<()> {
     Ok(())
 }