diff --git a/controllers/chaosengine_controller.go b/controllers/chaosengine_controller.go
index f07f7e08..f176f9f7 100644
--- a/controllers/chaosengine_controller.go
+++ b/controllers/chaosengine_controller.go
@@ -658,6 +658,12 @@ func getTargets(engine *chaosTypes.EngineInfo) string {
 		return strings.Join(targets, ";")
 	}
 
+	if engine.AppInfo.Appns == "ALL_NAMESPACES" {
+		engine.AppInfo.Appns = ""
+	} else if engine.AppInfo.Appns == "" {
+		engine.AppInfo.Appns = engine.Instance.Namespace
+	}
+
 	if engine.AppInfo.AppKind == "" {
 		engine.AppInfo.AppKind = "KIND"
 	}