diff --git a/src/eddsa.rs b/src/eddsa.rs
index 06a5e8d..4244a5c 100644
--- a/src/eddsa.rs
+++ b/src/eddsa.rs
@@ -75,7 +75,7 @@ pub struct SigningKey<TE: TECurveConfig> {
     public_key: PublicKey<TE>,
 }
 
-impl<TE: TECurveConfig> SigningKey<TE>
+impl<TE: TECurveConfig + Clone> SigningKey<TE>
 where
     TE::BaseField: PrimeField + Absorb,
 {
@@ -138,7 +138,7 @@ where
     }
 }
 
-impl<TE: TECurveConfig> PublicKey<TE>
+impl<TE: TECurveConfig + Clone> PublicKey<TE>
 where
     TE::BaseField: PrimeField + Absorb,
 {
diff --git a/src/lib.rs b/src/lib.rs
index 21abb04..c90c782 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -56,7 +56,7 @@ mod test {
         PoseidonConfig::new(full_rounds, partial_rounds, 5, mds, ark, rate, 1)
     }
 
-    fn run_test<TE: TECurveConfig, D: Digest>()
+    fn run_test<TE: TECurveConfig + Clone, D: Digest>()
     where
         TE::BaseField: Absorb + PrimeField,
     {
diff --git a/src/signature.rs b/src/signature.rs
index d3ac897..ea093d2 100644
--- a/src/signature.rs
+++ b/src/signature.rs
@@ -5,12 +5,12 @@ use ark_serialize::CanonicalSerialize;
 
 #[derive(Clone, Copy, Debug)]
 /// `SignatureComponents` contains the realized parts of a signature
-pub struct Signature<TE: TECurveConfig> {
+pub struct Signature<TE: TECurveConfig + Clone> {
     r: Affine<TE>,
     s: TE::ScalarField,
 }
 
-impl<TE: TECurveConfig> Signature<TE> {
+impl<TE: TECurveConfig + Clone> Signature<TE> {
     /// Serializes the signature components to bytes as uncompressed.
     /// Expect output size to be `size_of(TE::BaseField) * 2 + size_of(TE::ScalarField)`
     pub fn to_bytes(&self) -> Vec<u8> {