diff --git a/org/qmckl_jastrow.org b/org/qmckl_jastrow.org
index 6b17687..7f222a4 100644
--- a/org/qmckl_jastrow.org
+++ b/org/qmckl_jastrow.org
@@ -289,7 +289,7 @@ typedef struct qmckl_jastrow_struct{
   uint64_t  factor_ee_deriv_e_date;
   uint64_t  factor_en_deriv_e_date;
   uint64_t  factor_een_deriv_e_date;
-  uint64_t* type_nucl_vector;
+  int64_t* type_nucl_vector;
   double * aord_vector;
   double * bord_vector;
   double * cord_vector;