diff --git a/src/functions/initial_conditions/tnlCylinderFunction.h b/src/functions/initial_conditions/tnlCylinderFunction.h
index 55c222aae13a2fd9b8d520461dce67bbda4ab65a..4d28b4c3f6c2538e4a9deee073d7e94baeefc71b 100644
--- a/src/functions/initial_conditions/tnlCylinderFunction.h
+++ b/src/functions/initial_conditions/tnlCylinderFunction.h
@@ -142,7 +142,7 @@ class tnlCylinderFunction< 3, Real > : public tnlCylinderFunctionBase< Real >
 
 template< int Dimensions,
           typename Real >
-ostream& operator << ( ostream& str, const tnlExpBumpFunction< Dimensions, Real >& f )
+ostream& operator << ( ostream& str, const tnlCylinderFunction< Dimensions, Real >& f )
 {
    str << "Cylinder function.";
    return str;