diff --git a/python/sglang/srt/utils.py b/python/sglang/srt/utils.py
index 2c41076f515..ae4175b7d6b 100644
--- a/python/sglang/srt/utils.py
+++ b/python/sglang/srt/utils.py
@@ -2076,7 +2076,6 @@ def is_fa3_default_architecture(hf_config):
         "Llama4ForConditionalGeneration",
         "LlamaForCausalLM",
         "MistralForCausalLM",
-        "MixtralForCausalLM",
         "Gemma2ForCausalLM",
         "Gemma3ForConditionalGeneration",
         "Qwen3ForCausalLM",