diff --git a/extensions/azure-functions-http/runtime/src/main/java/io/quarkus/azure/functions/resteasy/runtime/BaseFunction.java b/extensions/azure-functions-http/runtime/src/main/java/io/quarkus/azure/functions/resteasy/runtime/BaseFunction.java
index 0f409fc01f076..9a3341f335e2a 100644
--- a/extensions/azure-functions-http/runtime/src/main/java/io/quarkus/azure/functions/resteasy/runtime/BaseFunction.java
+++ b/extensions/azure-functions-http/runtime/src/main/java/io/quarkus/azure/functions/resteasy/runtime/BaseFunction.java
@@ -3,6 +3,7 @@
 import java.io.ByteArrayOutputStream;
 import java.nio.channels.Channels;
 import java.nio.channels.WritableByteChannel;
+import java.nio.charset.StandardCharsets;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
@@ -62,7 +63,7 @@ protected HttpResponseMessage nettyDispatch(HttpRequestMessage<Optional<String>>
 
         HttpContent requestContent = LastHttpContent.EMPTY_LAST_CONTENT;
         if (request.getBody().isPresent()) {
-            ByteBuf body = Unpooled.wrappedBuffer(request.getBody().get().getBytes());
+            ByteBuf body = Unpooled.wrappedBuffer(request.getBody().get().getBytes(StandardCharsets.UTF_8));
             requestContent = new DefaultLastHttpContent(body);
         }