diff --git a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressure.H b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressure.H
index d0a85c7..f258adb 100644
--- a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressure.H
+++ b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressure.H
@@ -362,6 +362,7 @@ void BatchReactorHomogeneousConstantPressure::Equations(double* y, std::vector<d
 
 int BatchReactorHomogeneousConstantPressure::Print(const double t, const OpenSMOKE::OpenSMOKEVectorDouble& y)
 {
+	return 0;
 }
 
 #endif // BatchReactorHomogeneousConstantPressure_H
diff --git a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressureVirtualChemistry.H b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressureVirtualChemistry.H
index 3d08af3..ec6b44e 100644
--- a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressureVirtualChemistry.H
+++ b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantPressureVirtualChemistry.H
@@ -213,6 +213,7 @@ void BatchReactorHomogeneousConstantPressureVirtualChemistry::Equations(double*
 
 int BatchReactorHomogeneousConstantPressureVirtualChemistry::Print(const double t, const OpenSMOKE::OpenSMOKEVectorDouble& y)
 {
+	return 0;
 }
 
 #endif // BatchReactorHomogeneousConstantPressureVirtualChemistry_H
diff --git a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantVolume.H b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantVolume.H
index 8a140bb..a9e3c0d 100644
--- a/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantVolume.H
+++ b/solvers/laminarSMOKE/unsteady/BatchReactorHomogeneousConstantVolume.H
@@ -206,6 +206,7 @@ void BatchReactorHomogeneousConstantVolume::Equations(double* y, std::vector<dou
 
 int BatchReactorHomogeneousConstantVolume::Print(const double t, const OpenSMOKE::OpenSMOKEVectorDouble& y)
 {
+	return 0;
 }
 
 #endif // BatchReactorHomogeneousConstantVolume_H