diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultManagedHttpClientConnection.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultManagedHttpClientConnection.java
index 13c9daaf79..f5fb1f69f4 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultManagedHttpClientConnection.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultManagedHttpClientConnection.java
@@ -38,6 +38,7 @@
 import javax.net.ssl.SSLSocket;
 
 import org.apache.hc.client5.http.io.ManagedHttpClientConnection;
+import org.apache.hc.core5.annotation.Internal;
 import org.apache.hc.core5.http.ClassicHttpRequest;
 import org.apache.hc.core5.http.ClassicHttpResponse;
 import org.apache.hc.core5.http.ContentLengthStrategy;
@@ -56,7 +57,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-final class DefaultManagedHttpClientConnection
+@Internal
+public class DefaultManagedHttpClientConnection
         extends DefaultBHttpClientConnection implements ManagedHttpClientConnection, Identifiable {
 
     private static final Logger LOG = LoggerFactory.getLogger(DefaultManagedHttpClientConnection.class);
diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultManagedAsyncClientConnection.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultManagedAsyncClientConnection.java
index 6db73dd027..7ecb814149 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultManagedAsyncClientConnection.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultManagedAsyncClientConnection.java
@@ -35,6 +35,7 @@
 import javax.net.ssl.SSLSession;
 
 import org.apache.hc.client5.http.nio.ManagedAsyncClientConnection;
+import org.apache.hc.core5.annotation.Internal;
 import org.apache.hc.core5.concurrent.FutureCallback;
 import org.apache.hc.core5.http.EndpointDetails;
 import org.apache.hc.core5.http.HttpConnection;
@@ -57,7 +58,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-final class DefaultManagedAsyncClientConnection implements ManagedAsyncClientConnection, Identifiable {
+@Internal
+public class DefaultManagedAsyncClientConnection implements ManagedAsyncClientConnection, Identifiable {
 
     private static final Logger LOG = LoggerFactory.getLogger(DefaultManagedAsyncClientConnection.class);