diff --git a/packages/issuer/lib/VcIssuer.ts b/packages/issuer/lib/VcIssuer.ts
index 04e439de..af66ac26 100644
--- a/packages/issuer/lib/VcIssuer.ts
+++ b/packages/issuer/lib/VcIssuer.ts
@@ -519,7 +519,7 @@ export class VcIssuer<DIDDoc extends object> {
       }
       if (!iat) {
         throw new Error(IAT_ERROR)
-      } else if (iat > createdAt + tokenExpiresIn) {
+      } else if (iat > createdAt + tokenExpiresIn * 1000) {
         throw new Error(IAT_ERROR)
       }
       // todo: Add a check of iat against current TS on server with a skew
diff --git a/packages/issuer/lib/functions/CredentialOfferUtils.ts b/packages/issuer/lib/functions/CredentialOfferUtils.ts
index 137e4277..647dd46b 100644
--- a/packages/issuer/lib/functions/CredentialOfferUtils.ts
+++ b/packages/issuer/lib/functions/CredentialOfferUtils.ts
@@ -115,9 +115,9 @@ export function createCredentialOfferURI(
   return createCredentialOfferURIFromObject(credentialOffer, opts)
 }
 
-export const isPreAuthorizedCodeExpired = (state: CredentialOfferSession, expirationDuration: number) => {
+export const isPreAuthorizedCodeExpired = (state: CredentialOfferSession, expirationDurationInSeconds: number) => {
   const now = +new Date()
-  const expirationTime = state.createdAt + expirationDuration
+  const expirationTime = state.createdAt + expirationDurationInSeconds * 1000
   return now >= expirationTime
 }