diff --git a/python/llm/src/ipex_llm/transformers/npu_models/mp_models_base.py b/python/llm/src/ipex_llm/transformers/npu_models/mp_models_base.py
index a1dac609243..b25a3dae0fe 100644
--- a/python/llm/src/ipex_llm/transformers/npu_models/mp_models_base.py
+++ b/python/llm/src/ipex_llm/transformers/npu_models/mp_models_base.py
@@ -470,7 +470,7 @@ def layer_norm(self, hidden_states, layernorm_weight):
         )
         eps = self.constant(self.rms_norm_eps)
         hidden_states = self.eltwise_div(hidden_states, self.sqrt(self.eltwise_add(variance, eps)))
-        layernorm_weight = self.convert_to_fp32(layernorm_weight)
+        hidden_states = self.convert_to_fp16(hidden_states)
         hidden_states = self.eltwise_mul(layernorm_weight, hidden_states)
         hidden_states = self.convert_to_fp16(hidden_states)
         return hidden_states