diff --git a/src/alfasim_score/constants.py b/src/alfasim_score/constants.py
index cdd2c44..d053255 100644
--- a/src/alfasim_score/constants.py
+++ b/src/alfasim_score/constants.py
@@ -2,11 +2,11 @@
 
 from alfasim_score.units import DENSITY_UNIT
 from alfasim_score.units import DIAMETER_UNIT
+from alfasim_score.units import DIMENSIONLESS_UNIT
 from alfasim_score.units import FRACTION_UNIT
 from alfasim_score.units import HEAT_TRANSFER_COEFFICIENT_UNIT
 from alfasim_score.units import LENGTH_UNIT
 from alfasim_score.units import MASS_FLOW_RATE_UNIT
-from alfasim_score.units import NONE_UNIT
 from alfasim_score.units import PRESSURE_UNIT
 from alfasim_score.units import ROUGHNESS_UNIT
 from alfasim_score.units import STD_VOLUMETRIC_FLOW_RATE_UNIT
@@ -44,5 +44,5 @@
 
 # gas lift default values
 GAS_LIFT_VALVE_DEFAULT_DIAMETER = Scalar(0.25, DIAMETER_UNIT, "diameter")
-GAS_LIFT_VALVE_DEFAULT_DISCHARGE = Scalar(0.826, NONE_UNIT)
+GAS_LIFT_VALVE_DEFAULT_DISCHARGE = Scalar(0.826, DIMENSIONLESS_UNIT)
 GAS_LIFT_VALVE_DEFAULT_DELTA_P_MIN = Scalar(0.0, PRESSURE_UNIT)
diff --git a/src/alfasim_score/units.py b/src/alfasim_score/units.py
index 85f268e..c34c64b 100644
--- a/src/alfasim_score/units.py
+++ b/src/alfasim_score/units.py
@@ -14,4 +14,4 @@
 TEMPERATURE_UNIT = "degC"
 GAS_OIL_RATIO_UNIT = "sm3/sm3"
 HEAT_TRANSFER_COEFFICIENT_UNIT = "W/m2.K"
-NONE_UNIT = "unitless"
+DIMENSIONLESS_UNIT = "unitless"