diff --git a/benchmarks/utils.py b/benchmarks/utils.py
index 2c4e27d94be3c89e53c8b19e1f887ddab0cabc41_YmVuY2htYXJrcy91dGlscy5weQ==..3e5e26e0a92d4810319c18a5bdbeaeb74d15b305_YmVuY2htYXJrcy91dGlscy5weQ== 100644
--- a/benchmarks/utils.py
+++ b/benchmarks/utils.py
@@ -130,7 +130,7 @@
             new_format_info[new_format_name] = format_value
             format_variants[new_format_name].add(format_value)
 
-        repo_name = benchrepo[: -len(".benchrepo")]
+        repo_name = reference_repo['repo-prefix']
         repo_details[repo_name] = data
 
         if repo_hash is not None: