diff --git a/climax/core/constants.py b/climax/core/constants.py
index cfb6585b696792d0975abec7e1ae88016d0d91b8..20f67628da56e4f0782e05bbfec4ea5a84b35f72 100644
--- a/climax/core/constants.py
+++ b/climax/core/constants.py
@@ -39,8 +39,9 @@ ERA5_P_VARIABLE_NAME = {k: v for k, v in zip(ERA5_P_VARIABLES,
                                              ERA5_P_VARIABLES_SHORTCUT)}
 
 # ERA5 predictor variables on single levels
-ERA5_S_VARIABLES = ['mean_sea_level_pressure', 'orography', '2m_temperature', 'total_precipitation']
-ERA5_S_VARIABLES_SHORTCUT = ['p', 'o', 't2', 'pr']
+ERA5_S_VARIABLES = ['mean_sea_level_pressure', 'orography', '2m_temperature',
+                    'total_precipitation', 'surface_pressure']
+ERA5_S_VARIABLES_SHORTCUT = ['mslp', 'o', 't2', 'pr', 'p']
 ERA5_S_VARIABLE_NAME = {k: v for k, v in zip(ERA5_S_VARIABLES,
                                              ERA5_S_VARIABLES_SHORTCUT)}