diff --git a/ultralytics/engine/exporter.py b/ultralytics/engine/exporter.py
index 242e33d9..87dd0286 100644
--- a/ultralytics/engine/exporter.py
+++ b/ultralytics/engine/exporter.py
@@ -520,7 +520,7 @@ class Exporter:
             if isinstance(self.model, SegmentationModel):
                 dynamic["output0"] = {0: "batch", 2: "anchors"}  # shape(1, 116, 8400)
                 dynamic["output1"] = {0: "batch", 2: "mask_height", 3: "mask_width"}  # shape(1,32,160,160)
-            elif isinstance(self.model, DetectionModel):
+            elif isinstance(self.model, (DetectionModel, WorldModel)):
                 dynamic["output0"] = {0: "batch", 2: "anchors"}  # shape(1, 84, 8400)
             if self.args.nms:  # only batch size is dynamic with NMS
                 dynamic["output0"].pop(2)