diff --git a/packages/presentation-exchange/src/agent/PresentationExchange.ts b/packages/presentation-exchange/src/agent/PresentationExchange.ts
index 8c843ec7b..022429fb9 100644
--- a/packages/presentation-exchange/src/agent/PresentationExchange.ts
+++ b/packages/presentation-exchange/src/agent/PresentationExchange.ts
@@ -26,7 +26,7 @@ export class PresentationExchange implements IAgentPlugin {
   readonly schema = schema.IDidAuthSiopOpAuthenticator
   private readonly defaultStore: string
   private readonly defaultNamespace: string
-  private readonly pex  = new PEX()
+  private readonly pex = new PEX()
 
   readonly methods: IPresentationExchange = {
     pexStoreGetDefinition: this.pexStoreGetDefinition.bind(this),
diff --git a/packages/presentation-exchange/src/functions.ts b/packages/presentation-exchange/src/functions.ts
index 2fde599d4..1d03aeb64 100644
--- a/packages/presentation-exchange/src/functions.ts
+++ b/packages/presentation-exchange/src/functions.ts
@@ -21,7 +21,7 @@ export async function createPEXPresentationSignCallback(
   },
   context: IRequiredContext
 ): Promise<IPEXPresentationSignCallback> {
-  function determineProofFormat(format: Format | 'jwt' | 'lds' | 'EthereumEip712Signature2021', presentationDefinition: IPresentationDefinition) {
+  function determineProofFormat(format?: Format | 'jwt' | 'lds' | 'EthereumEip712Signature2021', presentationDefinition: IPresentationDefinition) {
     let proofFormat: ProofFormat = 'jwt'
     const formatOptions = format ?? args.format ?? presentationDefinition.format
     if (formatOptions) {
@@ -66,7 +66,7 @@ export async function createPEXPresentationSignCallback(
       throw Error(`Could not resolve DID document or match signing key to did ${idOpts.identifier.did}`)
     }
 
-    const proofFormat = determineProofFormat(format ?? 'jwt', presentationDefinition)
+    const proofFormat = determineProofFormat(format, presentationDefinition)
     let header
     if (!presentation.holder) {
       presentation.holder = id.did
diff --git a/packages/siopv2-oid4vp-op-auth/src/session/OID4VP.ts b/packages/siopv2-oid4vp-op-auth/src/session/OID4VP.ts
index 74875bb64..fd9f27b00 100644
--- a/packages/siopv2-oid4vp-op-auth/src/session/OID4VP.ts
+++ b/packages/siopv2-oid4vp-op-auth/src/session/OID4VP.ts
@@ -70,10 +70,7 @@ export class OID4VP {
   ): Promise<VerifiablePresentationWithDefinition> {
     if (opts?.subjectIsHolder && opts?.holderDID) {
       throw Error('Cannot both have subject is holder and a holderDID value at the same time (programming error)')
-    } else if (
-      !selectedVerifiableCredentials?.credentials ||
-      selectedVerifiableCredentials.credentials.length === 0
-    ) {
+    } else if (!selectedVerifiableCredentials?.credentials || selectedVerifiableCredentials.credentials.length === 0) {
       throw Error('No verifiable verifiableCredentials provided for presentation definition')
     }