diff --git a/ensembleperturbation/parsing/schism.py b/ensembleperturbation/parsing/schism.py
index cab3174c..19d332e1 100644
--- a/ensembleperturbation/parsing/schism.py
+++ b/ensembleperturbation/parsing/schism.py
@@ -827,7 +827,7 @@ def read_directory(
     @classmethod
     def _set_dry_to_null(cls, dataset: Dataset) -> Dataset:
         for var in cls.variables:
-            dataset[var] = dataset[var].where(dataset['dryFlagNode'] == 1, numpy.nan)
+            dataset[var] = dataset[var].where(dataset['dryFlagNode'] == 0, numpy.nan)
 
         return dataset