diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AbstractHttpAsyncClientBase.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AbstractHttpAsyncClientBase.java
index 264faa2c70..e3834026c1 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AbstractHttpAsyncClientBase.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AbstractHttpAsyncClientBase.java
@@ -116,7 +116,7 @@ public final void close(final CloseMode closeMode) {
         }
         ioReactor.initiateShutdown();
         ioReactor.close(closeMode);
-        executorService.shutdownNow();
+        executorService.shutdown();
         internalClose(closeMode);
     }