diff --git a/splipy/io/__init__.py b/splipy/io/__init__.py
index 6aaad3c..9e44cca 100644
--- a/splipy/io/__init__.py
+++ b/splipy/io/__init__.py
@@ -4,27 +4,23 @@
 from .stl import STL
 from .ofoam import OpenFOAM
 
+__all__ = ['G2', 'SVG', 'SPL', 'STL', 'OpenFOAM']
 
 from importlib.util import find_spec
+
+
 has_cv2 = find_spec('cv2')
-has_rhino = find_spec('rhino3dm')
 
 
 # GRDECL depends on optional cv2
 has_grdecl = has_cv2
-if has_cv2:
-    pass
-
-
-# ThreeDM depends on optional rhino3dm
-if has_rhino:
-    pass
-
-
-__all__ = ['G2', 'SVG', 'SPL', 'STL', 'OpenFOAM']
-
 if has_grdecl:
+    from .grdecl import GRDECL
     __all__.append('GRDECL')
 
+
+# ThreeDM depends on optional rhino3dm
+has_rhino = find_spec('rhino3dm')
 if has_rhino:
+    from .threedm import ThreeDM
     __all__.append('ThreeDM')