diff --git a/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java b/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
index 0f4dca20e286b..b8dedcde357e2 100644
--- a/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
+++ b/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
@@ -1623,6 +1623,9 @@ protected void warnAboutMissingJsonProviderIfNeeded(ResourceMethod method, Metho
             DefaultProducesHandler jsonDefaultProducersHandler,
             DefaultProducesHandler.Context context) {
         if (hasJson(method) || (hasNoTypesDefined(method) && isDefaultJson(jsonDefaultProducersHandler, context))) {
+            if (STRING.toString().equals(method.getSimpleReturnType())) { // when returning string, we assume that the method implementation is actually handling to conversion
+                return;
+            }
             boolean appProvidedJsonReaderExists = appProvidedJsonProviderExists(getSerializerScanningResult().getReaders());
             boolean appProvidedJsonWriterExists = appProvidedJsonProviderExists(getSerializerScanningResult().getWriters());
             if (!appProvidedJsonReaderExists || !appProvidedJsonWriterExists) {