diff --git a/buildstockbatch/postprocessing.py b/buildstockbatch/postprocessing.py
index b67a9127..0cdee410 100644
--- a/buildstockbatch/postprocessing.py
+++ b/buildstockbatch/postprocessing.py
@@ -382,7 +382,7 @@ def upload_results(aws_conf, output_dir, results_dir):
     for files in parquet_dir.rglob('*.parquet'):
         all_files.append(files.relative_to(parquet_dir))
 
-    s3_prefix = aws_conf.get('s3', {}).get('prefix', None)
+    s3_prefix = aws_conf.get('s3', {}).get('prefix', None).rstrip('/')
     s3_bucket = aws_conf.get('s3', {}).get('bucket', None)
     if not (s3_prefix and s3_bucket):
         logger.error("YAML file missing postprocessing:aws:s3:prefix and/or bucket entry.")