diff --git a/deepface/modules/modeling.py b/deepface/modules/modeling.py
index f9c6464..271fc25 100644
--- a/deepface/modules/modeling.py
+++ b/deepface/modules/modeling.py
@@ -40,7 +40,7 @@ def build_model(model_name: str) -> Any:
     if not "model_obj" in globals():
         model_obj = {}
 
-    if not model_name in model_obj:
+    if not model_name in model_obj.keys():
         model = models.get(model_name)
         if model:
             model = model()