diff --git a/python/sglang/srt/layers/layernorm.py b/python/sglang/srt/layers/layernorm.py
index b07164c53..7bef9d2ab 100644
--- a/python/sglang/srt/layers/layernorm.py
+++ b/python/sglang/srt/layers/layernorm.py
@@ -125,9 +125,8 @@ class RMSNorm(MultiPlatformOp):
             # (hidden_states+residual)+post_residual_addition != hidden_states+(residual+post_residual_addition),
             # we probably need to add another parameter to fused_add_rmsnorm
             post_residual_addition = kwargs.get("post_residual_addition")
-            residual = residual + (
-                post_residual_addition if post_residual_addition is not None else 0.0
-            )
+            if post_residual_addition is not None:
+                residual = residual + post_residual_addition
             fused_add_rmsnorm(x, residual, self.weight.data, self.variance_epsilon)
             return x, residual
         out = rmsnorm(x, self.weight.data, self.variance_epsilon)