diff --git a/convert_hf_to_gguf.py b/convert_hf_to_gguf.py
index e5dea18aeb..4c6ce4845c 100755
--- a/convert_hf_to_gguf.py
+++ b/convert_hf_to_gguf.py
@@ -3137,6 +3137,9 @@ class LlavaVisionModel(MmprojModel):
             assert self.hparams["norm_eps"] is not None, "norm_eps not found in params.json"
             if self.use_break_tok:
                 self.img_break_tok_id = self.find_vparam(["image_break_token_id"])
+                if self.img_break_tok_id < 0:
+                    # Fall back to tokenizer lookup
+                    self.img_break_tok_id = self.get_token_id("[IMG_BREAK]")
         else:
             raise ValueError(f"Unsupported model type: {self.hparams['model_type']}")
         logger.info(f"Image break token id: {self.img_break_tok_id}")