diff --git a/org/qmckl_local_energy.org b/org/qmckl_local_energy.org
index 390ebb7..903a259 100644
--- a/org/qmckl_local_energy.org
+++ b/org/qmckl_local_energy.org
@@ -841,6 +841,14 @@ qmckl_exit_code qmckl_provide_potential_energy(qmckl_context context) {
                            NULL);
   }
 
+  rc = qmckl_provide_nucleus_repulsion(ctx);
+  if (rc != QMCKL_SUCCESS) {
+    return qmckl_failwith( context,
+                           QMCKL_NOT_PROVIDED,
+                           "qmckl_nucleus_repulsion",
+                           NULL);
+  }
+
   rc = qmckl_provide_en_potential(ctx);
   if (rc != QMCKL_SUCCESS) {
     return qmckl_failwith( context,