diff --git a/MaterialLib/Fluid/Density/LinearTemperatureDependentDensity.h b/MaterialLib/Fluid/Density/LinearTemperatureDependentDensity.h
index dd130b89bb9e3db3d4ad4cbf06008e94fbb80dcd..f6a7408f833a6a28fa4b1238a158b73c364123c1 100644
--- a/MaterialLib/Fluid/Density/LinearTemperatureDependentDensity.h
+++ b/MaterialLib/Fluid/Density/LinearTemperatureDependentDensity.h
@@ -61,8 +61,9 @@ public:
                      const PropertyVariableType var) const override
     {
         (void)var_vals;
-        (void)var;
-        return - _rho0 * _beta;
+        if (var != PropertyVariableType::T)
+            return 0.0;
+        return -_rho0 * _beta;
     }
 
 private: