diff --git a/optimum_benchmark/backends/pytorch/backend.py b/optimum_benchmark/backends/pytorch/backend.py
index 07e45980..bb7212f7 100644
--- a/optimum_benchmark/backends/pytorch/backend.py
+++ b/optimum_benchmark/backends/pytorch/backend.py
@@ -308,28 +308,28 @@ def process_quantization_config(self) -> None:
 
         self.logger.info("\t+ Processing AutoQuantization config")
         self.quantization_config = AutoQuantizationConfig.from_dict(
-            (getattr(self.pretrained_config, "quantization_config") or {}).update(self.config.quantization_config)
+            dict(**getattr(self.pretrained_config, "quantization_config", {}), **self.config.quantization_config)
         )
 
     @property
     def is_quantized(self) -> bool:
         return self.config.quantization_scheme is not None or (
             hasattr(self.pretrained_config, "quantization_config")
-            and self.pretrained_config.quantization_config.get("quant_method", None) is not None
+            and self.pretrained_config.quantization_config.get("quant_method") is not None
         )
 
     @property
     def is_gptq_quantized(self) -> bool:
         return self.config.quantization_scheme == "gptq" or (
             hasattr(self.pretrained_config, "quantization_config")
-            and self.pretrained_config.quantization_config.get("quant_method", None) == "gptq"
+            and self.pretrained_config.quantization_config.get("quant_method") == "gptq"
         )
 
     @property
     def is_awq_quantized(self) -> bool:
         return self.config.quantization_scheme == "awq" or (
             hasattr(self.pretrained_config, "quantization_config")
-            and self.pretrained_config.quantization_config.get("quant_method", None) == "awq"
+            and self.pretrained_config.quantization_config.get("quant_method") == "awq"
         )
 
     @property
@@ -341,11 +341,11 @@ def is_exllamav2(self) -> bool:
                 (
                     hasattr(self.pretrained_config, "quantization_config")
                     and hasattr(self.pretrained_config.quantization_config, "exllama_config")
-                    and self.pretrained_config.quantization_config.exllama_config.get("version", None) == 2
+                    and self.pretrained_config.quantization_config.exllama_config.get("version") == 2
                 )
                 or (
                     "exllama_config" in self.config.quantization_config
-                    and self.config.quantization_config["exllama_config"].get("version", None) == 2
+                    and self.config.quantization_config["exllama_config"].get("version") == 2
                 )
             )
         )