diff --git a/server/text_generation_server/layers/gptq/custom_autotune.py b/server/text_generation_server/layers/gptq/custom_autotune.py
index 1eb40f1e..0388ef20 100644
--- a/server/text_generation_server/layers/gptq/custom_autotune.py
+++ b/server/text_generation_server/layers/gptq/custom_autotune.py
@@ -91,7 +91,7 @@ class Autotuner(triton.KernelInterface):
                 kernel_call, quantiles=(0.5, 0.2, 0.8), rep=40
             )
         except triton.OutOfResources:
-            return (float("inf"), float("inf"), float("inf"))
+            return [float("inf"), float("inf"), float("inf")]
 
     def run(self, *args, **kwargs):
         self.nargs = dict(zip(self.arg_names, args))