diff --git a/Modelica/Fluid/Sources.mo b/Modelica/Fluid/Sources.mo
index fa22a1a790..dd0a97999e 100644
--- a/Modelica/Fluid/Sources.mo
+++ b/Modelica/Fluid/Sources.mo
@@ -28,8 +28,7 @@ package Sources "Define fixed or prescribed boundary conditions"
       "Boundary specific enthalpy"
       annotation (Dialog(group="Boundary temperature or boundary specific enthalpy",
                   enable = not use_T));
-    parameter Medium.MassFraction X[Medium.nX](
-         ) = Medium.X_default
+    parameter Medium.MassFraction X[Medium.nX] = Medium.X_default
       "Boundary mass fractions m_i/m"
       annotation (Dialog(group = "Only for multi-substance flow", enable=Medium.nXi > 0));
     parameter Medium.ExtraProperty C[Medium.nC](