diff --git a/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientReaderInterceptorContextImpl.java b/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientReaderInterceptorContextImpl.java
index 200f0c5bcc8eb..99fa3837fd647 100644
--- a/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientReaderInterceptorContextImpl.java
+++ b/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientReaderInterceptorContextImpl.java
@@ -91,7 +91,8 @@ public Object proceed() throws IOException, WebApplicationException {
                 }
             }
 
-            StringBuilder errorMessage = new StringBuilder("Response could not be mapped to type " + entityType);
+            StringBuilder errorMessage = new StringBuilder(
+                    "Response could not be mapped to type " + entityType + " for response with media type " + mediaType);
             if (!contextualizers.isEmpty()) {
                 var input = new MissingMessageBodyReaderErrorMessageContextualizer.Input() {
                     @Override