diff --git a/packages/core/src/types-hoist/options.ts b/packages/core/src/types-hoist/options.ts
index 09dab550be4c..04ec1d25ef17 100644
--- a/packages/core/src/types-hoist/options.ts
+++ b/packages/core/src/types-hoist/options.ts
@@ -365,7 +365,7 @@ export interface ClientOptions<TO extends BaseTransportOptions = BaseTransportOp
    *
    * @returns The modified span payload that will be sent.
    */
-  beforeSendSpan?: (span: SpanJSON) => SpanJSON;
+  beforeSendSpan?: (span: SpanJSON) => SpanJSON | null;
 
   /**
    * An event-processing callback for transaction events, guaranteed to be invoked after all other event