diff --git a/src/featureforest/models/SAM2/adapter.py b/src/featureforest/models/SAM2/adapter.py
index ed14e00..571d4ef 100644
--- a/src/featureforest/models/SAM2/adapter.py
+++ b/src/featureforest/models/SAM2/adapter.py
@@ -28,7 +28,7 @@ def __init__(
         self.name = name
         # we need sam2 image encoder part
         self.encoder = image_encoder
-        self.encoder_num_channels = 256
+        self.encoder_num_channels = 256 * 3
         self._set_patch_size()
         self.device = device