diff --git a/backends/cadence/aot/utils.py b/backends/cadence/aot/utils.py
index b7d72d137f7..b711d45994b 100644
--- a/backends/cadence/aot/utils.py
+++ b/backends/cadence/aot/utils.py
@@ -45,6 +45,10 @@ def __init__(self, rms_expected_value: float) -> None:
         super().__init__()
 
 
+class ISSRuntimeFailure(Exception):
+    pass
+
+
 # Get the output size of a 1D convolution given the input size and parameters
 def get_conv1d_output_size(
     in_size: torch.Size,