diff --git a/acvm-repo/brillig_vm/src/black_box.rs b/acvm-repo/brillig_vm/src/black_box.rs
index a136e32f59..d37258036f 100644
--- a/acvm-repo/brillig_vm/src/black_box.rs
+++ b/acvm-repo/brillig_vm/src/black_box.rs
@@ -426,7 +426,7 @@ impl BrilligBigintSolver {
         if modulus_lhs != modulus_rhs {
             return Err(BlackBoxResolutionError::Failed(
                 func,
-                "BigInt modulus mismatch".to_string(),
+                "moduli should be identical in BigInt operation".to_string(),
             ));
         }
         let id = self.create_bigint_id();