diff --git a/src/rand/rpo.rs b/src/rand/rpo.rs
index e156b0ec..7ec7e3d1 100644
--- a/src/rand/rpo.rs
+++ b/src/rand/rpo.rs
@@ -3,6 +3,7 @@ use winter_math::{FieldElement, StarkField};
 
 use super::{Felt, RandFeltsGen, Word, ZERO};
 use crate::hash::rpo::{Rpo256, RpoDigest};
+use crate::utils::collections::Vec;
 use crate::utils::vec;
 
 // CONSTANTS