diff --git a/packages/opentelemetry-sdk-trace-base/src/export/BatchSpanProcessorBase.ts b/packages/opentelemetry-sdk-trace-base/src/export/BatchSpanProcessorBase.ts
index 345a7800e2..e4eb9b367d 100644
--- a/packages/opentelemetry-sdk-trace-base/src/export/BatchSpanProcessorBase.ts
+++ b/packages/opentelemetry-sdk-trace-base/src/export/BatchSpanProcessorBase.ts
@@ -163,7 +163,7 @@ export abstract class BatchSpanProcessorBase<T extends BufferConfig>
         promises.push(this._export(spans));
       }
       if (this._flushInProgress) {
-        promises.push(this._flushInProgress)
+        promises.push(this._flushInProgress);
       }
       Promise.all(promises)
         .then(() => {