diff --git a/api/s4_tanks.py b/api/s4_tanks.py
index 3833c84..31d53c9 100644
--- a/api/s4_tanks.py
+++ b/api/s4_tanks.py
@@ -163,7 +163,7 @@ class InpTank:
         self.max_level = float(tokens[4])
         self.diameter = float(tokens[5])
         self.min_vol = float(tokens[6])
-        self.vol_curve = str(tokens[7]) if num_without_desc >= 8 else None
+        self.vol_curve = str(tokens[7]) if num_without_desc >= 8 and tokens[7] != '*' else None
         self.overflow = str(tokens[8].upper()) if num_without_desc >= 9 else None
         self.desc = str(tokens[-1]) if has_desc else None