diff --git a/deepmd/pt/model/model/make_model.py b/deepmd/pt/model/model/make_model.py
index 15b8a00613..83abf9ee4a 100644
--- a/deepmd/pt/model/model/make_model.py
+++ b/deepmd/pt/model/model/make_model.py
@@ -177,7 +177,7 @@ def forward_common(
                 self.get_sel(),
                 # types will be distinguished in the lower interface,
                 # so it doesn't need to be distinguished here
-                mixed_types=False,
+                mixed_types=True,
                 box=bb,
             )
             model_predict_lower = self.forward_common_lower(