diff --git a/httpcore5/src/main/java/org/apache/hc/core5/http/impl/nio/ServerHttp1StreamDuplexer.java b/httpcore5/src/main/java/org/apache/hc/core5/http/impl/nio/ServerHttp1StreamDuplexer.java
index d256feffab..fafd72fc62 100644
--- a/httpcore5/src/main/java/org/apache/hc/core5/http/impl/nio/ServerHttp1StreamDuplexer.java
+++ b/httpcore5/src/main/java/org/apache/hc/core5/http/impl/nio/ServerHttp1StreamDuplexer.java
@@ -244,7 +244,7 @@ void updateInputMetrics(final HttpRequest request, final BasicHttpConnectionMetr
     @Override
     void updateOutputMetrics(final HttpResponse response, final BasicHttpConnectionMetrics connMetrics) {
         if (response.getCode() >= HttpStatus.SC_OK) {
-            connMetrics.incrementRequestCount();
+            connMetrics.incrementResponseCount();
         }
     }