diff --git a/deepface/detectors/FastMtcnnWrapper.py b/deepface/detectors/FastMtcnnWrapper.py
index d9b0b20..20461a3 100644
--- a/deepface/detectors/FastMtcnnWrapper.py
+++ b/deepface/detectors/FastMtcnnWrapper.py
@@ -8,9 +8,9 @@ def build_model():
     # Optional dependency
     try:
         from facenet_pytorch import MTCNN as fast_mtcnn
-    except ModuleNotFoundError:
-        print("This is an optional detector, ensure the library is installed. \
-              Please install using 'pip install facenet-pytorch' ")
+    except ModuleNotFoundError as e:
+        raise ImportError("This is an optional detector, ensure the library is installed. \
+              Please install using 'pip install facenet-pytorch' ") from e
 
 
     face_detector = fast_mtcnn(image_size=160,