diff --git a/src/finn/custom_op/fpgadataflow/concat.py b/src/finn/custom_op/fpgadataflow/concat.py
index 210b6b7fd..985ac83ea 100644
--- a/src/finn/custom_op/fpgadataflow/concat.py
+++ b/src/finn/custom_op/fpgadataflow/concat.py
@@ -29,7 +29,6 @@
 
 import numpy as np
 from qonnx.core.datatype import DataType
-from qonnx.util.basic import roundup_to_integer_multiple
 
 from finn.custom_op.fpgadataflow.hwcustomop import HWCustomOp
 
@@ -134,10 +133,6 @@ def execute_node(self, context, graph):
         result = np.concatenate(inp_values, axis=-1)
         context[node.output[0]] = result
 
-    def get_instream_width_padded(self, ind=0):
-        in_width = self.get_instream_width(ind)
-        return roundup_to_integer_multiple(in_width, 8)
-
     def get_verilog_top_module_intf_names(self):
         intf_names = super().get_verilog_top_module_intf_names()
         n_inputs = self.get_n_inputs()