diff --git a/impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowDefinitionId.java b/impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowDefinitionId.java
index b0f37ef3a..1a2bfef1c 100644
--- a/impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowDefinitionId.java
+++ b/impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowDefinitionId.java
@@ -33,6 +33,11 @@ public static WorkflowDefinitionId fromName(String name) {
     return new WorkflowDefinitionId(DEFAULT_NAMESPACE, name, DEFAULT_VERSION);
   }
 
+  @Override
+  public String toString() {
+    return toString(":");
+  }
+
   public String toString(String separator) {
     return namespace + separator + name + separator + version;
   }