diff --git a/earthdiagnostics/ocean/siasiesiv.py b/earthdiagnostics/ocean/siasiesiv.py
index 94c1e78b10d6f68f73c4a46de1ca234ca370ee94..64eb90f3671872d877233b849b2a583bfa1ee6d3 100644
--- a/earthdiagnostics/ocean/siasiesiv.py
+++ b/earthdiagnostics/ocean/siasiesiv.py
@@ -254,8 +254,7 @@ class Siasiesiv(Diagnostic):
             else:
                 var_res.units = "m^2"
             for i, basin in enumerate(self.masks):
-                if not np.all(res[i, ...] == 0):
-                    var_region[i, ...] = netCDF4.stringtoarr(str(basin), 50)
-                    var_res[..., i] = res[i, ...]
+                var_region[i, ...] = netCDF4.stringtoarr(str(basin), 50)
+                var_res[..., i] = res[i, ...]
             handler_temp.close()
             self.generated[var].set_local_file(temp, diagnostic=self)