diff --git a/chart_config.py b/chart_config.py
index 6b656fe..c6487a4 100644
--- a/chart_config.py
+++ b/chart_config.py
@@ -1,7 +1,7 @@
 from configparser import ConfigParser
 class ChartConfig:
     def __init__(self, path):
-        cfgp = ConfigParser()
+        cfgp = ConfigParser(interpolation=None)
         cfgp.read(path)
         self.chart_config = cfgp["chart"]
 
diff --git a/config/generic.ini b/config/generic.ini
index 3b13e6c..6fe717e 100644
--- a/config/generic.ini
+++ b/config/generic.ini
@@ -16,4 +16,4 @@ T_mix=unit:K
 T_sorb=unit:K
 T_sorb.target=-
 dil=-
-lev=unit:%%
+lev=unit:%