diff --git a/httpcore5/src/main/java/org/apache/hc/core5/reactor/SingleCoreIOReactor.java b/httpcore5/src/main/java/org/apache/hc/core5/reactor/SingleCoreIOReactor.java
index 248ce1049..a9c936554 100644
--- a/httpcore5/src/main/java/org/apache/hc/core5/reactor/SingleCoreIOReactor.java
+++ b/httpcore5/src/main/java/org/apache/hc/core5/reactor/SingleCoreIOReactor.java
@@ -214,8 +214,8 @@ private void processPendingChannels() throws IOException {
                     ioSessionDecorator,
                     sessionListener,
                     closedSessions);
-            dataChannel.upgrade(this.eventHandlerFactory.createHandler(dataChannel, attachment));
             dataChannel.setSocketTimeout(this.reactorConfig.getSoTimeout());
+            dataChannel.upgrade(this.eventHandlerFactory.createHandler(dataChannel, attachment));
             key.attach(dataChannel);
             dataChannel.handleIOEvent(SelectionKey.OP_CONNECT);
         }