diff --git a/python/sglang/srt/models/gemma4_mtp.py b/python/sglang/srt/models/gemma4_mtp.py
index f652661fc..3978a1be1 100644
--- a/python/sglang/srt/models/gemma4_mtp.py
+++ b/python/sglang/srt/models/gemma4_mtp.py
@@ -91,7 +91,7 @@ class Gemma4AssistantForCausalLM(Gemma4ForCausalLM):
             2 * self.backbone_hidden_size,
             self.hidden_size,
             bias=False,
-            quant_config=None,
+            quant_config=quant_config,
             prefix=add_prefix("pre_projection", prefix),
         )
         self.model = Gemma4TextModel(
@@ -103,7 +103,7 @@ class Gemma4AssistantForCausalLM(Gemma4ForCausalLM):
             self.hidden_size,
             self.backbone_hidden_size,
             bias=False,
-            quant_config=None,
+            quant_config=quant_config,
             prefix=add_prefix("post_projection", prefix),
         )