diff --git a/scripts/build_ship_raster.py b/scripts/build_ship_raster.py
index 7d59c4b12..af9b87020 100644
--- a/scripts/build_ship_raster.py
+++ b/scripts/build_ship_raster.py
@@ -54,8 +54,8 @@
 
     with zipfile.ZipFile(snakemake.input.ship_density) as zip_f:
         zip_f.extract("shipdensity_global.tif")
-        ship_density = xr.open_rasterio("shipdensity_global.tif")
-
-    da = ship_density.drop(["band"]).sel(x=slice(min(xs),max(Xs)), y=slice(max(Ys),min(ys)))
-
-    da.to_netcdf(snakemake.output[0])
+        with xr.open_rasterio("shipdensity_global.tif") as ship_density:
+            ship_density = ship_density.drop(["band"]).sel(x=slice(min(xs),max(Xs)), y=slice(max(Ys),min(ys)))
+            ship_density.to_netcdf(snakemake.output[0])
+        
+    os.remove("shipdensity_global.tif") 
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