diff --git a/extensions/resteasy-reactive/jaxrs-client-reactive/deployment/src/main/java/io/quarkus/jaxrs/client/reactive/deployment/JaxrsClientReactiveProcessor.java b/extensions/resteasy-reactive/jaxrs-client-reactive/deployment/src/main/java/io/quarkus/jaxrs/client/reactive/deployment/JaxrsClientReactiveProcessor.java
index 85b1fb98e769f6..133f34267c66ad 100644
--- a/extensions/resteasy-reactive/jaxrs-client-reactive/deployment/src/main/java/io/quarkus/jaxrs/client/reactive/deployment/JaxrsClientReactiveProcessor.java
+++ b/extensions/resteasy-reactive/jaxrs-client-reactive/deployment/src/main/java/io/quarkus/jaxrs/client/reactive/deployment/JaxrsClientReactiveProcessor.java
@@ -31,6 +31,7 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletionStage;
@@ -2532,15 +2533,36 @@ private void addFormParam(BytecodeCreator methodCreator, String paramName, Resul
                 notNullValue.load(methodIndex));
         ResultHandle isString = notNullValue.instanceOf(convertedFormParam, String.class);
         BranchResult isStringBranch = notNullValue.ifTrue(isString);
-        isStringBranch.falseBranch().throwException(IllegalStateException.class,
-                "Form parameter '" + paramName
-                        + "' could not be converted to 'String' for REST Client interface '"
-                        + restClientInterfaceClassName + "'. A proper implementation of '"
-                        + ParamConverter.class.getName() + "' needs to be returned by a '"
-                        + ParamConverterProvider.class.getName()
-                        + "' that is registered with the client via the @RegisterProvider annotation on the REST Client interface.");
         isStringBranch.trueBranch().invokeInterfaceMethod(MULTIVALUED_MAP_ADD, formParams,
                 notNullValue.load(paramName), convertedFormParam);
+
+        // if the converted value is not a string, then:
+        // - if it's a primitive type, use the valueOf() method.
+        if (EndpointIndexer.primitiveTypes.containsKey(parameterType)) {
+            ResultHandle convertedFormParamAsString = isStringBranch.falseBranch().invokeStaticMethod(
+                    MethodDescriptor.ofMethod(Objects.class, "toString", String.class, Object.class),
+                    convertedFormParam);
+            isStringBranch.falseBranch().invokeInterfaceMethod(MULTIVALUED_MAP_ADD, formParams,
+                    notNullValue.load(paramName), convertedFormParamAsString);
+        } else {
+            // - if it's an enum, use the name() method.
+            ResultHandle isEnum = isStringBranch.falseBranch().instanceOf(convertedFormParam, Enum.class);
+            BranchResult isEnumBranch = isStringBranch.falseBranch().ifTrue(isEnum);
+            ResultHandle enumAsString = isEnumBranch.trueBranch().invokeVirtualMethod(
+                    MethodDescriptor.ofMethod(parameterType, "name", String.class),
+                    convertedFormParam);
+            isEnumBranch.trueBranch().invokeInterfaceMethod(MULTIVALUED_MAP_ADD, formParams,
+                    notNullValue.load(paramName), enumAsString);
+
+            // - Otherwise, return exception
+            isEnumBranch.falseBranch().throwException(IllegalStateException.class,
+                    "Form parameter '" + paramName
+                            + "' could not be converted to 'String' for REST Client interface '"
+                            + restClientInterfaceClassName + "'. A proper implementation of '"
+                            + ParamConverter.class.getName() + "' needs to be returned by a '"
+                            + ParamConverterProvider.class.getName()
+                            + "' that is registered with the client via the @RegisterProvider annotation on the REST Client interface.");
+        }
     }
 
     private void addCookieParam(BytecodeCreator invoBuilderEnricher, AssignableResultHandle invocationBuilder,
diff --git a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/FormParamTest.java b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/FormParamTest.java
index 06e44ca38a2196..fa8382cc0837e8 100644
--- a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/FormParamTest.java
+++ b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/FormParamTest.java
@@ -24,7 +24,7 @@ public class FormParamTest {
     @RegisterExtension
     static final QuarkusUnitTest TEST = new QuarkusUnitTest()
             .withApplicationRoot((jar) -> jar
-                    .addClasses(FormClient.class, SubFormClient.class, Resource.class));
+                    .addClasses(FormClient.class, SubFormClient.class, Resource.class, Mode.class));
 
     @TestHTTPResource
     URI baseUri;
@@ -50,6 +50,13 @@ void shouldPassFormParamFromSubResource() {
         assertThat(result).isEqualTo("sub rootParam1:par1,rootParam2:par 2,subParam1:spar1,subParam2:spar 2");
     }
 
+    @Test
+    void shouldSupportParsingDifferentTypes() {
+        FormClient formClient = RestClientBuilder.newBuilder().baseUri(baseUri).build(FormClient.class);
+        String result = formClient.withTypes("a", 1, 2, Mode.On);
+        assertThat(result).isEqualTo("root text:a,number:1,wrapNumber:2,mode:On");
+    }
+
     public interface FormClient {
         @POST
         @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
@@ -58,6 +65,13 @@ public interface FormClient {
 
         @Path("/sub")
         SubFormClient subForm(@FormParam("rootParam1") String formParam1, @FormParam("rootParam2") String formParam2);
+
+        @POST
+        @Path("/types")
+        @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+        @Produces(MediaType.TEXT_PLAIN)
+        String withTypes(@FormParam("text") String text, @FormParam("number") int number,
+                @FormParam("wrapNumber") Integer wrapNumber, @FormParam("mode") Mode mode);
     }
 
     public interface SubFormClient {
diff --git a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Mode.java b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Mode.java
new file mode 100644
index 00000000000000..ab87072daf9289
--- /dev/null
+++ b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Mode.java
@@ -0,0 +1,6 @@
+package io.quarkus.rest.client.reactive.form;
+
+public enum Mode {
+    Off,
+    On
+}
diff --git a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Resource.java b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Resource.java
index eb59b96008df82..43c6e134210dea 100644
--- a/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Resource.java
+++ b/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/form/Resource.java
@@ -30,4 +30,12 @@ public Response getUriEntityAndQueryParam(@RestForm String rootParam1,
         return Response.ok(String.format("sub rootParam1:%s,rootParam2:%s,subParam1:%s,subParam2:%s",
                 rootParam1, rootParam2, subParam1, subParam2)).build();
     }
+
+    @POST
+    @Path("/types")
+    public Response getWithTypes(@RestForm String text, @RestForm int number, @RestForm Integer wrapNumber,
+            @RestForm Mode mode) {
+        return Response.ok(String.format("root text:%s,number:%s,wrapNumber:%s,mode:%s", text, number, wrapNumber, mode))
+                .build();
+    }
 }