diff --git a/exporters/memory/include/opentelemetry/exporters/memory/in_memory_span_exporter.h b/exporters/memory/include/opentelemetry/exporters/memory/in_memory_span_exporter.h
index 9861294229..27efae379b 100644
--- a/exporters/memory/include/opentelemetry/exporters/memory/in_memory_span_exporter.h
+++ b/exporters/memory/include/opentelemetry/exporters/memory/in_memory_span_exporter.h
@@ -65,13 +65,6 @@ class InMemorySpanExporter final : public opentelemetry::sdk::trace::SpanExporte
     return sdk::common::ExportResult::kSuccess;
   }
 
-  /**
-   * Force flush the exporter.
-   * @param timeout an option timeout, default to max.
-   * @return return true when all data are exported, and false when timeout
-   */
-  bool ForceFlush(std::chrono::microseconds /* timeout */) noexcept override { return true; }
-
   /**
    * @param timeout an optional value containing the timeout of the exporter
    * note: passing custom timeout values is not currently supported for this exporter