diff --git a/src/lagrangian/molecularDynamics/molecule/mdTools/meanMomentumEnergyAndNMols.H b/src/lagrangian/molecularDynamics/molecule/mdTools/meanMomentumEnergyAndNMols.H
index a23468df1cad87528482679518932453bb980e95..037812cf8101d7297116917503d9080c614537f2 100644
--- a/src/lagrangian/molecularDynamics/molecule/mdTools/meanMomentumEnergyAndNMols.H
+++ b/src/lagrangian/molecularDynamics/molecule/mdTools/meanMomentumEnergyAndNMols.H
@@ -82,7 +82,7 @@ label singleStepDOFs = 0;
 
         const vector& molV(mol().v());
 
-        const vector& molOmega(inv(molMoI) & mol().pi());
+        const vector molOmega(inv(molMoI) & mol().pi());
 
         vector molPiGlobal = mol().Q() & mol().pi();