diff --git a/src/polyTopoChange/polyTopoChange/edgeCollapser.C b/src/polyTopoChange/polyTopoChange/edgeCollapser.C
index 1635c46b28..cf76d0de32 100644
--- a/src/polyTopoChange/polyTopoChange/edgeCollapser.C
+++ b/src/polyTopoChange/polyTopoChange/edgeCollapser.C
@@ -42,7 +42,7 @@ namespace Foam
 }
 
 
-Foam::HashSet<Foam::label> Foam::edgeCollapser::checkBadFaces
+Foam::labelHashSet Foam::edgeCollapser::checkBadFaces
 (
     const polyMesh& mesh,
     const dictionary& meshQualityDict