diff --git a/utils/atomic/convertWeightsToHeader.py b/utils/atomic/convertWeightsToHeader.py
index 48466d4..f58cf1d 100644
--- a/utils/atomic/convertWeightsToHeader.py
+++ b/utils/atomic/convertWeightsToHeader.py
@@ -125,6 +125,19 @@ namespace chemSpecies {{
         Species(const std::string_view name, const std::string_view el, const int nz, const int n, const int z, const int a, const double bindingEnergy, const std::string_view betaCode, const double betaDecayEnergy, const double atomicMass, const double atomicMassUnc)
             : m_name(name), m_el(el), m_nz(nz), m_n(n), m_z(z), m_a(a), m_bindingEnergy(bindingEnergy), m_betaCode(betaCode), m_betaDecayEnergy(betaDecayEnergy), m_atomicMass(atomicMass), m_atomicMassUnc(atomicMassUnc) {{}};
 
+        Species(const Species& species) {{
+            m_name = species.m_name;
+            m_el = species.m_el;
+            m_nz = species.m_nz;
+            m_n = species.m_n;
+            m_z = species.m_z;
+            m_a = species.m_a;
+            m_bindingEnergy = species.m_bindingEnergy;
+            m_betaCode = species.m_betaCode;
+            m_betaDecayEnergy = species.m_betaDecayEnergy;
+            m_atomicMass = species.m_atomicMass;
+            m_atomicMassUnc = species.m_atomicMassUnc;
+        }}
 
         double mass() const {{
             return m_atomicMass;