diff --git a/src/Mod/Material/FluidMaterial/Nitrogen.FCMat b/src/Mod/Material/FluidMaterial/Nitrogen.FCMat
index 9362414372..03ce88fc51 100644
--- a/src/Mod/Material/FluidMaterial/Nitrogen.FCMat
+++ b/src/Mod/Material/FluidMaterial/Nitrogen.FCMat
@@ -14,7 +14,7 @@ PrandtlNumber = 0.7
 
 [Thermal]
 SpecificHeat = 1.04 kJ/kg/K
-ThermalConductivity = 25.83e−3 W/m/K
+ThermalConductivity = 25.83e-3 W/m/K
 ; volumetric expansion coeff of ideal gas depends on temperature and pressure
 VolumetricThermalExpansionCoefficient = 3.43e-3 1/K