diff --git a/src/chip.rs b/src/chip.rs
index 5e969e7..6b20c44 100644
--- a/src/chip.rs
+++ b/src/chip.rs
@@ -156,8 +156,8 @@ id_wrapper!(HierarchyIds, CellInstId);
 id_wrapper!(NetlistIds, NetId);
 id_wrapper!(NetlistIds, PinId);
 id_wrapper!(NetlistIds, PinInstId);
-id_wrapper!(LayoutBase, LayerId);
-id_wrapper!(LayoutBase, ShapeId);
+id_wrapper!(LayoutIds, LayerId);
+id_wrapper!(LayoutIds, ShapeId);
 
 /// ID wrapper for TerminalID.
 /// A terminal can either be a pin or a pin instance.
diff --git a/src/pychip.rs b/src/pychip.rs
index 4797259..42229ae 100644
--- a/src/pychip.rs
+++ b/src/pychip.rs
@@ -197,12 +197,14 @@ impl<'a> HierarchyBase for PyChip<'a> {
     }
 }
 
-impl<'a> LayoutBase for PyChip<'a> {
+impl<'a> LayoutIds for PyChip<'a> {
     type Coord = i32;
     type Area = i64;
     type LayerId = PyIdObject;
     type ShapeId = PyIdObject;
+}
 
+impl<'a> LayoutBase for PyChip<'a> {
     fn dbu(&self) -> Self::Coord {
         self.call_function_and_convert("dbu", ())
     }