diff --git a/common/eth2/src/lib.rs b/common/eth2/src/lib.rs
index 1bcf52192d..e665a6c1d1 100644
--- a/common/eth2/src/lib.rs
+++ b/common/eth2/src/lib.rs
@@ -2669,7 +2669,7 @@ impl BeaconNodeHttpClient {
     pub async fn post_validator_beacon_committee_selections(
         &self,
         selections: &[BeaconCommitteeSelection],
-    ) -> Result<GenericResponse<SelectionProof>, Error> {
+    ) -> Result<GenericResponse<Vec<SelectionProof>>, Error> {
         let mut path = self.eth_path(V1)?;
 
         path.path_segments_mut()
diff --git a/consensus/types/src/selection_proof.rs b/consensus/types/src/selection_proof.rs
index 47362717bd..60446ee3c5 100644
--- a/consensus/types/src/selection_proof.rs
+++ b/consensus/types/src/selection_proof.rs
@@ -8,6 +8,7 @@ use ssz::Encode;
 use std::cmp;
 
 #[derive(arbitrary::Arbitrary, PartialEq, Debug, Clone, Serialize, Deserialize)]
+#[serde(transparent)]
 pub struct SelectionProof(Signature);
 
 impl SelectionProof {
diff --git a/validator_client/validator_services/src/duties_service.rs b/validator_client/validator_services/src/duties_service.rs
index 54af3dc772..498369a87e 100644
--- a/validator_client/validator_services/src/duties_service.rs
+++ b/validator_client/validator_services/src/duties_service.rs
@@ -159,7 +159,8 @@ async fn make_selection_proof<T: SlotClock + 'static, E: EthSpec>(
             .map_err(|e| {
                 Error::FailedToProduceSelectionProof(ValidatorStoreError::Middleware(e.to_string()))
             })?
-            .data
+            .data[0]
+            .clone()
     } else {
         validator_store
             .produce_selection_proof(duty.pubkey, duty.slot)