diff --git a/agentic_security/refusal_classifier/hybrid_classifier.py b/agentic_security/refusal_classifier/hybrid_classifier.py
index 38075e6..9021f4c 100644
--- a/agentic_security/refusal_classifier/hybrid_classifier.py
+++ b/agentic_security/refusal_classifier/hybrid_classifier.py
@@ -86,7 +86,7 @@ class HybridRefusalClassifier:
         detector: RefusalDetector,
         weight: float = 1.0,
         name: str | None = None,
-    ) -> HybridRefusalClassifier:
+    ) -> "HybridRefusalClassifier":
         """Add a detection method with specified weight.
 
         Args: