diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharPushConsumer.java b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharPushConsumer.java
index fccf509c6..2d26172a8 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharPushConsumer.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharPushConsumer.java
@@ -37,6 +37,7 @@
 import org.apache.hc.core5.http.HttpException;
 import org.apache.hc.core5.http.HttpRequest;
 import org.apache.hc.core5.http.HttpResponse;
+import org.apache.hc.core5.http.config.CharCodingConfig;
 import org.apache.hc.core5.http.nio.AsyncPushConsumer;
 import org.apache.hc.core5.http.nio.entity.AbstractCharDataConsumer;
 import org.apache.hc.core5.http.protocol.HttpContext;
@@ -48,6 +49,19 @@
  */
 public abstract class AbstractCharPushConsumer extends AbstractCharDataConsumer implements AsyncPushConsumer {
 
+    private final Charset defaultCharset;
+
+    public AbstractCharPushConsumer() {
+        this.defaultCharset = StandardCharsets.UTF_8;
+    }
+
+    protected AbstractCharPushConsumer(final int bufSize,
+                                       final CharCodingConfig charCodingConfig) {
+        super(bufSize, charCodingConfig);
+        this.defaultCharset = charCodingConfig != null && charCodingConfig.getCharset() != null
+                ? charCodingConfig.getCharset() : StandardCharsets.UTF_8;
+    }
+
     /**
      * Triggered to signal the beginning of data processing.
      *
@@ -72,7 +86,7 @@ public final void consumePromise(
             }
             Charset charset = contentType != null ? contentType.getCharset() : null;
             if (charset == null) {
-                charset = StandardCharsets.US_ASCII;
+                charset = defaultCharset;
             }
             setCharset(charset);
             start(promise, response, contentType != null ? contentType : ContentType.DEFAULT_TEXT);
diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharResponseConsumer.java b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharResponseConsumer.java
index 825f93f72..eb39dbfaa 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharResponseConsumer.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/AbstractCharResponseConsumer.java
@@ -37,6 +37,7 @@
 import org.apache.hc.core5.http.EntityDetails;
 import org.apache.hc.core5.http.HttpException;
 import org.apache.hc.core5.http.HttpResponse;
+import org.apache.hc.core5.http.config.CharCodingConfig;
 import org.apache.hc.core5.http.nio.AsyncResponseConsumer;
 import org.apache.hc.core5.http.nio.entity.AbstractCharDataConsumer;
 import org.apache.hc.core5.http.protocol.HttpContext;
@@ -51,6 +52,18 @@
 public abstract class AbstractCharResponseConsumer<T> extends AbstractCharDataConsumer implements AsyncResponseConsumer<T> {
 
     private volatile FutureCallback<T> resultCallback;
+    private final Charset defaultCharset;
+
+    public AbstractCharResponseConsumer() {
+        this.defaultCharset = StandardCharsets.UTF_8;
+    }
+
+    protected AbstractCharResponseConsumer(final int bufSize,
+                                           final CharCodingConfig charCodingConfig) {
+        super(bufSize, charCodingConfig);
+        this.defaultCharset = charCodingConfig != null && charCodingConfig.getCharset() != null
+                ? charCodingConfig.getCharset() : StandardCharsets.UTF_8;
+    }
 
     /**
      * Triggered to signal the beginning of data processing.
@@ -90,7 +103,7 @@ public final void consumeResponse(
             }
             Charset charset = contentType != null ? contentType.getCharset() : null;
             if (charset == null) {
-                charset = StandardCharsets.US_ASCII;
+                charset = defaultCharset;
             }
             setCharset(charset);
             start(response, contentType != null ? contentType : ContentType.DEFAULT_TEXT);