diff --git a/modules/util/viirs.py b/modules/util/viirs.py
index 0209b7e87b5bdf3bbf51eda523b28593836b328f..d626df4936b584cfdba046940a461de7c26d1b27 100644
--- a/modules/util/viirs.py
+++ b/modules/util/viirs.py
@@ -41,8 +41,8 @@ def run_all(directory):
         mod_nda = (mod_nda - mod_mean) / mod_std
         img_nda = (img_nda - img_mean) / img_std
 
-        np.save('/data/Personal/rink/viirs/mod_res_'+cnt, mod_nda)
-        np.save('/data/Personal/rink/viirs/img_res_'+cnt, img_nda)
+        np.save('/data/Personal/rink/viirs/mod_res_'+str(cnt), mod_nda)
+        np.save('/data/Personal/rink/viirs/img_res_'+str(cnt), img_nda)
 
 
 def run(mod_res_filename, img_res_filename, mod_tiles, img_tiles):