diff --git a/presto/dataset.py b/presto/dataset.py
index 64997c2..e4c189b 100644
--- a/presto/dataset.py
+++ b/presto/dataset.py
@@ -495,11 +495,11 @@ def nc_to_arrays(
         cls, filepath: Path
     ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
         ds = xr.open_dataset(filepath)
-        epsg_coords = CRS.from_wkt(xr.open_dataset(filepath).crs.attrs["crs_wkt"]).to_epsg()
+        epsg = int(CRS.from_wkt(xr.open_dataset(filepath).crs.attrs["crs_wkt"]).to_epsg())
         inarr = ds.drop("crs").to_array(dim="bands")
 
         eo_data, mask = cls._extract_eo_data(inarr)
-        latlons = cls._extract_latlons(inarr, epsg_coords)
+        latlons = cls._extract_latlons(inarr, epsg)
         months = cls._extract_months(inarr)
 
         if cls.Y not in ds: