diff --git a/vllm/model_executor/models/granitemoe.py b/vllm/model_executor/models/granitemoe.py
index 51296ef0cc08..b518a0a6cbde 100644
--- a/vllm/model_executor/models/granitemoe.py
+++ b/vllm/model_executor/models/granitemoe.py
@@ -348,6 +348,7 @@ class GraniteMoeForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
 
         self.config = config
         self.lora_config = lora_config
+        self.quant_config = quant_config  # Required by MixtralForCausalLM
 
         self.model = GraniteMoeModel(vllm_config=vllm_config,
                                      prefix=maybe_prefix(prefix, "model"))