diff --git a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/multipart/MultipartEncoderModeTest.java b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/multipart/MultipartEncoderModeTest.java
new file mode 100644
index 00000000000000..4e9a88b3a645c7
--- /dev/null
+++ b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/multipart/MultipartEncoderModeTest.java
@@ -0,0 +1,89 @@
+package io.quarkus.rest.client.reactive.multipart;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+
+import org.eclipse.microprofile.rest.client.annotation.RegisterProvider;
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+import org.eclipse.microprofile.rest.client.inject.RestClient;
+import org.jboss.resteasy.reactive.ResponseStatus;
+import org.jboss.resteasy.reactive.RestForm;
+import org.jboss.resteasy.reactive.client.api.QuarkusRestClientProperties;
+import org.jboss.resteasy.reactive.client.impl.multipart.PausableHttpPostRequestEncoder;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.junit.jupiter.api.io.TempDir;
+
+import io.quarkus.test.QuarkusUnitTest;
+import io.quarkus.test.common.http.TestHTTPResource;
+import jakarta.inject.Inject;
+import jakarta.ws.rs.Consumes;
+import jakarta.ws.rs.FormParam;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.client.ClientRequestContext;
+import jakarta.ws.rs.client.ClientRequestFilter;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+
+public class MultipartEncoderModeTest {
+    @TestHTTPResource
+    URI baseUri;
+
+    @RegisterExtension
+    static final QuarkusUnitTest TEST = new QuarkusUnitTest()
+            .withApplicationRoot(jar -> jar.addClasses(Resource.class, Client.class))
+            .withConfigurationResource("multipart-encoder-mode-test.properties");
+
+    @Inject
+    @RestClient
+    Client client;
+
+    @Test
+    void shouldPassUsingCustomMultipartPostEncoderMode(@TempDir File tempDir) throws IOException {
+        File file = File.createTempFile("MultipartTest", ".txt", tempDir);
+        assertThat(client.upload(file)).isEqualTo("OK");
+    }
+
+    static class MultipartEncoderModeCheck implements ClientRequestFilter {
+        @Override
+        public void filter(ClientRequestContext requestContext) throws IOException {
+            Object mode = requestContext.getConfiguration().getProperty(QuarkusRestClientProperties.MULTIPART_ENCODER_MODE);
+            if (mode == null) {
+                requestContext.abortWith(Response.serverError().entity("encoderMode is null").build());
+                return;
+            }
+            if (mode.getClass() != PausableHttpPostRequestEncoder.EncoderMode.class) {
+                requestContext.abortWith(Response.serverError().entity("encoderMode illegal type").build());
+                return;
+            }
+        }
+    }
+
+    @Path("resource")
+    static public class Resource {
+        @Path("upload")
+        @POST
+        @Consumes(MediaType.MULTIPART_FORM_DATA)
+        @Produces(MediaType.TEXT_PLAIN)
+        @ResponseStatus(200)
+        public String upload(@RestForm File file) {
+            return "OK";
+        }
+    }
+
+    @Path("resource")
+    @RegisterRestClient(configKey = "client")
+    @RegisterProvider(MultipartEncoderModeCheck.class)
+    static public interface Client {
+        @Path("upload")
+        @POST
+        @Consumes(MediaType.MULTIPART_FORM_DATA)
+        @Produces(MediaType.TEXT_PLAIN)
+        String upload(@FormParam("file") File file);
+    }
+}
diff --git a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/resources/multipart-encoder-mode-test.properties b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/resources/multipart-encoder-mode-test.properties
new file mode 100644
index 00000000000000..8b0eef3890109a
--- /dev/null
+++ b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/resources/multipart-encoder-mode-test.properties
@@ -0,0 +1,2 @@
+quarkus.rest-client.multipart-post-encoder-mode=HTML5
+quarkus.rest-client.client.url=http://localhost:${quarkus.http.test-port}
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