diff --git a/vllm/model_executor/models/qwen3_vl.py b/vllm/model_executor/models/qwen3_vl.py
index bf02df7b4968..4dd5b0631851 100644
--- a/vllm/model_executor/models/qwen3_vl.py
+++ b/vllm/model_executor/models/qwen3_vl.py
@@ -767,7 +767,7 @@ def _get_video_second_idx(
         sampled_num_frames: int | None = None,
     ) -> list[int]:
         video_processor = self.get_video_processor()
-        merge_size = video_processor.merge_size
+        temporal_patch_size = video_processor.temporal_patch_size
         indices = metadata["frames_indices"]
 
         # metadata["fps"] refers to the true fps of the input video.
@@ -806,7 +806,7 @@ def _get_video_second_idx(
                 .astype(int)
                 .tolist()
             )
-        timestamps = self._calculate_timestamps(indices, video_fps, merge_size)
+        timestamps = self._calculate_timestamps(indices, video_fps, temporal_patch_size)
         return timestamps