diff --git a/applications/modules/multiphaseEuler/phaseSystems/diameterModels/velocityGroup/sizeGroup/sizeGroup.C b/applications/modules/multiphaseEuler/phaseSystems/diameterModels/velocityGroup/sizeGroup/sizeGroup.C
index a1185a4fa0..1e6da76b7c 100644
--- a/applications/modules/multiphaseEuler/phaseSystems/diameterModels/velocityGroup/sizeGroup/sizeGroup.C
+++ b/applications/modules/multiphaseEuler/phaseSystems/diameterModels/velocityGroup/sizeGroup/sizeGroup.C
@@ -45,7 +45,7 @@ Foam::IOobject Foam::diameterModels::sizeGroup::fieldIo
         (
             IOobject::groupName
             (
-                "f" + (i == -1 ? "Default" : Foam::name(i)),
+                name + (i == -1 ? "Default" : Foam::name(i)),
                 group.phase().name()
             ),
             group.phase().mesh().time().name(),