diff --git a/km3buu/geometry.py b/km3buu/geometry.py
index 3f1aa667fc371677e4193ad0496d11567d3d3ad8..fbc1b86648342a72cef8ce866a72a04889cb2f07 100644
--- a/km3buu/geometry.py
+++ b/km3buu/geometry.py
@@ -167,7 +167,7 @@ class NoVolume(DetectorVolume):
         return vtx_pos, vtx_dir, weight, None
 
 
-class CanVolume(DetectorVolume):
+class CANVolume(DetectorVolume):
     """
     Cylindrical detector geometry, only CAN / no propagation