diff --git a/tensorrt_llm/_torch/models/modeling_qwen3vl.py b/tensorrt_llm/_torch/models/modeling_qwen3vl.py
index 312e5ea745..8a5087731e 100644
--- a/tensorrt_llm/_torch/models/modeling_qwen3vl.py
+++ b/tensorrt_llm/_torch/models/modeling_qwen3vl.py
@@ -1138,6 +1138,7 @@ class Qwen3VLModelBase(PreTrainedModel):
             "video": "<|vision_start|><|video_pad|><|vision_end|>",
         },
         placeholder_placement=MultimodalPlaceholderPlacement.BEFORE_TEXT,
+        placeholders_separator="",
     ),
 )
 class Qwen3VLModel(Qwen3VLModelBase):
diff --git a/tensorrt_llm/_torch/models/modeling_qwen3vl_moe.py b/tensorrt_llm/_torch/models/modeling_qwen3vl_moe.py
index 74cd16ec69..66da3c153e 100644
--- a/tensorrt_llm/_torch/models/modeling_qwen3vl_moe.py
+++ b/tensorrt_llm/_torch/models/modeling_qwen3vl_moe.py
@@ -41,6 +41,7 @@ from .modeling_utils import ModelConfig, register_auto_model, register_vision_en
             "video": "<|vision_start|><|video_pad|><|vision_end|>",
         },
         placeholder_placement=MultimodalPlaceholderPlacement.BEFORE_TEXT,
+        placeholders_separator="",
     ),
 )
 class Qwen3MoeVLModel(Qwen3VLModelBase):