diff --git a/src/ACTSSeededCKFTrackingProc.cxx b/src/ACTSSeededCKFTrackingProc.cxx
index 788ca75..fc73847 100644
--- a/src/ACTSSeededCKFTrackingProc.cxx
+++ b/src/ACTSSeededCKFTrackingProc.cxx
@@ -525,7 +525,7 @@ void ACTSSeededCKFTrackingProc::processEvent(LCEvent *evt) {
   auto spacePointsGrouping = Acts::CylindricalBinnedGroup<SSPoint>(
       std::move(grid), bottomBinFinder, topBinFinder);
 
-  Acts::SeedFinder<SSPoint> finder(finderCfg);
+  Acts::SeedFinder<SSPoint, Acts::CylindricalSpacePointGrid<SSPoint>> finder(finderCfg);
   decltype(finder)::SeedingState state;
   std::vector<Acts::Seed<SSPoint>> seeds;