diff --git a/src/algorithms/pid/MergeParticleID.cc b/src/algorithms/pid/MergeParticleID.cc
index 8655d2fb5f..0078c3ef1d 100644
--- a/src/algorithms/pid/MergeParticleID.cc
+++ b/src/algorithms/pid/MergeParticleID.cc
@@ -6,6 +6,7 @@
 #include <edm4eic/CherenkovParticleIDHypothesis.h>
 #include <edm4eic/TrackSegmentCollection.h>
 #include <fmt/core.h>
+#include <podio/ObjectID.h>
 #include <podio/RelationRange.h>
 #include <spdlog/common.h>
 #include <stddef.h>