diff --git a/hermesv3_gr/modules/writing/writer_monarch.py b/hermesv3_gr/modules/writing/writer_monarch.py
index 3321b06c0f0945da74668f8e8d50d6c6bb503663..e5019262657d9e68302d2e049212a64ed015dafc 100644
--- a/hermesv3_gr/modules/writing/writer_monarch.py
+++ b/hermesv3_gr/modules/writing/writer_monarch.py
@@ -369,8 +369,8 @@ class WriterMonarch(Writer):
             # Rotated pole
             mapping = netcdf.createVariable('rotated_pole', 'c')
             mapping.grid_mapping_name = 'rotated_latitude_longitude'
-            mapping.grid_north_pole_latitude = self.grid.new_pole_latitude_degrees
-            mapping.grid_north_pole_longitude = 90 - self.grid.new_pole_longitude_degrees
+            mapping.grid_north_pole_latitude = 90 - self.grid.new_pole_latitude_degrees
+            mapping.grid_north_pole_longitude = self.grid.new_pole_longitude_degrees
         elif LambertConformalConic:
             # CRS
             mapping = netcdf.createVariable('Lambert_conformal', 'i')