diff --git a/src/sagemaker/model.py b/src/sagemaker/model.py
index 5b4cddf98f..6d41031125 100644
--- a/src/sagemaker/model.py
+++ b/src/sagemaker/model.py
@@ -817,7 +817,7 @@ def _upload_code(self, key_prefix, repack=False):
 
         if repack:
             bucket = self.bucket or self.sagemaker_session.default_bucket()
-            repacked_model_data = "s3://" + os.path.join(bucket, key_prefix, "model.tar.gz")
+            repacked_model_data = "s3://" + "/".join([bucket, key_prefix, "model.tar.gz"])
 
             utils.repack_model(
                 inference_script=self.entry_point,