diff --git a/concrete-optimizer/src/optimization/decomposition/mod.rs b/concrete-optimizer/src/optimization/decomposition/mod.rs
index 0b4e32bc0..0a197fcc0 100644
--- a/concrete-optimizer/src/optimization/decomposition/mod.rs
+++ b/concrete-optimizer/src/optimization/decomposition/mod.rs
@@ -31,7 +31,3 @@ pub fn cache(
         cb: circuit_bootstrap::cache(security_level, processing_unit, complexity_model.clone()),
     }
 }
-
-trait ComplexityModelClone: ComplexityModel + Clone {}
-
-impl<T: ComplexityModel + Clone> ComplexityModelClone for T {}