diff --git a/src/diffusers/commands/fp16_safetensors.py b/src/diffusers/commands/fp16_safetensors.py
index ec91bba357a0..c8f3d9ed0a0b 100644
--- a/src/diffusers/commands/fp16_safetensors.py
+++ b/src/diffusers/commands/fp16_safetensors.py
@@ -99,7 +99,7 @@ def run(self):
             from huggingface_hub._commit_api import CommitOperationAdd
 
         model_index = hf_hub_download(repo_id=self.ckpt_id, filename="model_index.json")
-        with open(model_index, "r") as f:
+        with open(model_index, "r", encoding="utf-8") as f:
             pipeline_class_name = json.load(f)["_class_name"]
         pipeline_class = getattr(import_module("diffusers"), pipeline_class_name)
         self.logger.info(f"Pipeline class imported: {pipeline_class_name}.")
diff --git a/src/diffusers/loaders/single_file_utils.py b/src/diffusers/loaders/single_file_utils.py
index ac707947d491..2526ffdd1dd0 100644
--- a/src/diffusers/loaders/single_file_utils.py
+++ b/src/diffusers/loaders/single_file_utils.py
@@ -500,7 +500,7 @@ def load_single_file_checkpoint(
 
 def fetch_original_config(original_config_file, local_files_only=False):
     if os.path.isfile(original_config_file):
-        with open(original_config_file, "r") as fp:
+        with open(original_config_file, "r", encoding="utf-8") as fp:
             original_config_file = fp.read()
 
     elif is_valid_url(original_config_file):