diff --git a/aiserver.py b/aiserver.py
index 48d34f43..629dcba3 100644
--- a/aiserver.py
+++ b/aiserver.py
@@ -2395,7 +2395,7 @@ def load_model(use_gpu=True, gpu_layers=None, disk_layers=None, initial_load=Fal
                                     try:
                                         f = z.open(f"archive/data/{storage_key}")
                                     except:
-                                        f = z.open(f"%s/data/{storage_key}" % zipfolder)
+                                        f = z.open(f"{zipfolder}/data/{storage_key}")
                                     current_offset = 0
                                 if current_offset != model_dict[key].seek_offset:
                                     f.read(model_dict[key].seek_offset - current_offset)
diff --git a/tpu_mtj_backend.py b/tpu_mtj_backend.py
index 886552bd..4b27493e 100644
--- a/tpu_mtj_backend.py
+++ b/tpu_mtj_backend.py
@@ -1287,7 +1287,7 @@ def load_model(path: str, driver_version="tpu_driver0.1_dev20210607", hf_checkpo
                         try:
                             f = z.open(f"archive/data/{storage_key}")
                         except:
-                            f = z.open(f"%s/data/{storage_key}" % zipfolder)
+                            f = z.open(f"{zipfolder}/data/{storage_key}")
                         current_offset = 0
                     if current_offset != model_dict[key].seek_offset:
                         f.read(model_dict[key].seek_offset - current_offset)