diff --git a/src/primitives/poseidon.rs b/src/primitives/poseidon.rs
index c91302fd..b00764a8 100644
--- a/src/primitives/poseidon.rs
+++ b/src/primitives/poseidon.rs
@@ -11,7 +11,7 @@ mod test_vectors;
 use grain::SboxType;
 
 /// A specification for a Poseidon permutation.
-pub trait PoseidonSpec<F: FieldExt> {
+pub trait Spec<F: FieldExt> {
     /// The arity of this specification.
     fn arity(&self) -> usize;
 
@@ -60,7 +60,7 @@ impl<F: FieldExt> Generic<F> {
     }
 }
 
-impl<F: FieldExt> PoseidonSpec<F> for Generic<F> {
+impl<F: FieldExt> Spec<F> for Generic<F> {
     fn arity(&self) -> usize {
         self.t as usize
     }
diff --git a/src/primitives/poseidon/test_vectors.rs b/src/primitives/poseidon/test_vectors.rs
index cbe88c8c..7fbaf6f6 100644
--- a/src/primitives/poseidon/test_vectors.rs
+++ b/src/primitives/poseidon/test_vectors.rs
@@ -1,7 +1,7 @@
 use halo2::arithmetic::FieldExt;
 use pasta_curves::pallas;
 
-use super::{Generic, PoseidonSpec};
+use super::{Generic, Spec};
 
 // $ sage generate_parameters_grain.sage 1 0 255 3 8 120 0x40000000000000000000000000000000224698fc094cf91b992d30ed00000001
 // Number of round constants: 384