diff --git a/timm/models/vitamin.py b/timm/models/vitamin.py
index 6e0c28f0..db1f2669 100644
--- a/timm/models/vitamin.py
+++ b/timm/models/vitamin.py
@@ -281,7 +281,7 @@ class GeGluMlp(nn.Module):
 def _create_vitamin(variant, pretrained=False, embed_cfg=None, **kwargs):
     out_indices = kwargs.pop('out_indices', 3)
     assert embed_cfg is not None
-    backbone = MbConvStages(cfg=embed_cfg)
+    backbone = MbConvStages(cfg=embed_cfg, in_chans=kwargs.get('in_chans', 3))
     kwargs['embed_layer'] = partial(HybridEmbed, backbone=backbone, proj=False)
     kwargs.setdefault('patch_size', 1)  # default patch size for hybrid models if not set