diff --git a/src/models/heston.rs b/src/models/heston.rs
index e99972f..fcbcd6e 100644
--- a/src/models/heston.rs
+++ b/src/models/heston.rs
@@ -1,4 +1,4 @@
-use ndarray::{Array1, Array2, Shape};
+use ndarray::Array1;
 
 use crate::processes::correlated;