diff --git a/operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/ResourceIDMapper.java b/operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/ResourceIDMapper.java
index cc78bcbb82..396d16c032 100644
--- a/operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/ResourceIDMapper.java
+++ b/operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/ResourceIDMapper.java
@@ -60,7 +60,10 @@ static <R, ID> ResourceIDMapper<R, ID> resourceIdProviderMapper() {
         return (ID) resourceIDProvider.resourceId();
       } else {
         throw new IllegalStateException(
-            "Resource does not implement ExternalDependentIDProvider: " + r.getClass());
+            "Resource does not implement "
+                + ResourceIDProvider.class.getSimpleName()
+                + ": "
+                + r.getClass());
       }
     };
   }