diff --git a/src/mercury_engine_data_structures/formats/bmsmsd.py b/src/mercury_engine_data_structures/formats/bmsmsd.py
index e361549a..1e19bdb5 100644
--- a/src/mercury_engine_data_structures/formats/bmsmsd.py
+++ b/src/mercury_engine_data_structures/formats/bmsmsd.py
@@ -15,7 +15,7 @@
     "tile_size" / construct.Array(2, Float32l),
     "x_tiles" / Int32sl,
     "y_tiles" / Int32sl,
-    "dimension" / Struct(
+    "map_dimensions" / Struct(
         "bottom_left" / CVector2D,
         "top_right" / CVector2D,
     ),