diff --git a/segmentation_models_pytorch/decoders/deeplabv3/decoder.py b/segmentation_models_pytorch/decoders/deeplabv3/decoder.py
index 54661ef8..e20acf3f 100644
--- a/segmentation_models_pytorch/decoders/deeplabv3/decoder.py
+++ b/segmentation_models_pytorch/decoders/deeplabv3/decoder.py
@@ -70,7 +70,7 @@ def forward(self, *features):
 class DeepLabV3PlusDecoder(nn.Module):
     def __init__(
         self,
-        encoder_channels: Sequence[int, ...],
+        encoder_channels: Sequence[int],
         encoder_depth: Literal[3, 4, 5],
         out_channels: int,
         atrous_rates: Iterable[int],
@@ -79,7 +79,11 @@ def __init__(
         aspp_dropout: float,
     ):
         super().__init__()
-        if output_stride not in {8, 16}:
+        if encoder_depth not in (3, 4, 5):
+            raise ValueError(
+                "Encoder depth should be 3, 4 or 5, got {}.".format(encoder_depth)
+            )
+        if output_stride not in (8, 16):
             raise ValueError(
                 "Output stride should be 8 or 16, got {}.".format(output_stride)
             )