1 files changed, 2 insertions, 1 deletions

diff --git a/parse_exps.py b/parse_exps.py
index 82febfc..9871baf 100755
--- a/parse_exps.py
+++ b/parse_exps.py
@@ -182,7 +182,8 @@ def get_bases(builder, exps, opts):
     will be calculated.'''
     bases = [None]*len(exps)
 
-    base_table = make_base_table(opts.scale_against, builder, exps)
+    base_table = make_base_table(opts.scale_against,
+                                 copy.deepcopy(builder), exps)
     if not base_table:
         return bases