diff --git a/TopoPyScale/fetch_era5.py b/TopoPyScale/fetch_era5.py
index 2e31a14..14ff07b 100644
--- a/TopoPyScale/fetch_era5.py
+++ b/TopoPyScale/fetch_era5.py
@@ -186,7 +186,7 @@ def era5_request_surf(dataset, year, month, bbox, target, product, time, output_
                  '31'
                  ],
          'time': time,
-         'grid': [0.25, 0.25],
+         'grid': "0.25/0.25",
          'data_format': output_format,
          'download_format': 'unarchived'
          },
@@ -237,7 +237,7 @@ def era5_request_plev(dataset, year, month, bbox, target, product, time, plevels
                 '31'
             ],
             'time': time,
-            'grid': [0.25, 0.25],
+            'grid': "0.25/0.25",
             'data_format': output_format,
             'download_format': 'unarchived'
         },
@@ -601,4 +601,4 @@ def era5_request_plev_snowmapper(today, latN, latS, lonE, lonW, eraDir, plevels,
             'download_format': 'unarchived'
         },
         target)
-    print(target + " complete")
\ No newline at end of file
+    print(target + " complete")