diff --git a/packages/types/src/transaction.ts b/packages/types/src/transaction.ts
index caae6c49027d..3339ff47dbb8 100644
--- a/packages/types/src/transaction.ts
+++ b/packages/types/src/transaction.ts
@@ -66,7 +66,7 @@ export interface Transaction extends TransactionContext, Omit<Span, 'setName' |
    * Was this transaction chosen to be sent as part of the sample?
    * @deprecated Use `spanIsSampled(transaction)` instead.
    */
-  sampled?: boolean;
+  sampled?: boolean | undefined;
 
   /**
    * @inheritDoc