diff --git a/Tracking/TrkTools/TrkParticleCreator/src/TrackParticleCreatorTool.cxx b/Tracking/TrkTools/TrkParticleCreator/src/TrackParticleCreatorTool.cxx
index 59d718b06441ff8bd1d1c93ed364d12c50cbbf20..744f9a97a461401b26665632f6d95cdea6d42977 100644
--- a/Tracking/TrkTools/TrkParticleCreator/src/TrackParticleCreatorTool.cxx
+++ b/Tracking/TrkTools/TrkParticleCreator/src/TrackParticleCreatorTool.cxx
@@ -945,7 +945,7 @@ TrackParticleCreatorTool::setTrackSummary(xAOD::TrackParticle& tp, const TrackSu
     ATH_MSG_DEBUG("now do muon hit info");
     Muon::IMuonHitSummaryTool::CompactSummary msSummary = m_hitSummaryTool->summary(summary);
     uint8_t numberOfPrecisionLayers = msSummary.nprecisionLayers;
-    ATH_MSG_DEBUG("# of prec layers: " << numberOfPrecisionLayers);
+    ATH_MSG_DEBUG("# of prec layers: " << static_cast<unsigned int>(numberOfPrecisionLayers));
     uint8_t numberOfPrecisionHoleLayers = msSummary.nprecisionHoleLayers;
     uint8_t numberOfPhiLayers = msSummary.nphiLayers;
     uint8_t numberOfPhiHoleLayers = msSummary.nphiHoleLayers;