diff --git a/examples/v1/train_full/train_full_ulysses_cp.yaml b/examples/v1/train_full/train_full_ulysses_cp.yaml
index 2b7ba713a..167e3dfe6 100644
--- a/examples/v1/train_full/train_full_ulysses_cp.yaml
+++ b/examples/v1/train_full/train_full_ulysses_cp.yaml
@@ -3,6 +3,7 @@ trust_remote_code: true
 model_class: llm
 
 template: qwen3_nothink
+flash_attn: flash_attention_2
 
 # FSDP Config
 dist_config: