diff --git a/Analysis/Core/include/AnalysisCore/MC.h b/Analysis/Core/include/AnalysisCore/MC.h
index 54e0c17cef813..35bc55f0c08e6 100644
--- a/Analysis/Core/include/AnalysisCore/MC.h
+++ b/Analysis/Core/include/AnalysisCore/MC.h
@@ -61,7 +61,7 @@ bool isStable(int pdg)
 
 // Ported from AliRoot AliStack::IsPhysicalPrimary
 template <typename Particles, typename Particle>
-bool isPhysicalPrimary(Particle& particle)
+bool isPhysicalPrimary(const Particle& particle)
 {
   // Test if a particle is a physical primary according to the following definition:
   // Particles produced in the collision including products of strong and