diff --git a/api/s3_reservoirs.py b/api/s3_reservoirs.py
index 821b57a..7ba3f82 100644
--- a/api/s3_reservoirs.py
+++ b/api/s3_reservoirs.py
@@ -126,7 +126,7 @@ class InpReservoir:
 
         self.id = str(tokens[0])
         self.head = float(tokens[1])
-        self.pattern = float(tokens[2]) if num_without_desc >= 3 else None
+        self.pattern = str(tokens[2]) if num_without_desc >= 3 else None
         self.desc = str(tokens[-1]) if has_desc else None