diff --git a/benchmarl/models/gnn.py b/benchmarl/models/gnn.py
index f18c9038..518c75f2 100644
--- a/benchmarl/models/gnn.py
+++ b/benchmarl/models/gnn.py
@@ -149,11 +149,8 @@ def __init__(
                 if _unravel_key_to_tuple(key)[-1] not in (position_key, velocity_key)
             ]
         )  # Input keys
-        if (
-            self.position_key is not None
-            and not not self.exclude_pos_from_node_features
-        ):
-            self.input_features += self.pos_features
+        if self.position_key is not None and not self.exclude_pos_from_node_features:
+            self.input_features += self.pos_features - 1
         if self.velocity_key is not None:
             self.input_features += self.vel_features