diff --git a/model.py b/model.py
index d61512fc..677e87d4 100644
--- a/model.py
+++ b/model.py
@@ -585,7 +585,12 @@ def generate_gen(self, prompt: str, **kwargs):
         if cfg_scale not in [None, 1.0]:
             if self.use_cfg:
                 gen_settings.cfg_scale = cfg_scale
-                negative_prompt = kwargs.get("negative_prompt")
+
+                # If the negative prompt is empty, use the BOS token
+                negative_prompt = unwrap(
+                    kwargs.get("negative_prompt"),
+                    self.tokenizer.bos_token
+                )
             else:
                 logger.warn(
                     "CFG is currently disabled. "