diff --git a/base/modules/psb_const_mod.F90 b/base/modules/psb_const_mod.F90
index 648a1669..26a100a7 100644
--- a/base/modules/psb_const_mod.F90
+++ b/base/modules/psb_const_mod.F90
@@ -215,8 +215,8 @@ module psb_const_mod
   ! Duplicate coefficients handling
   ! These are usually set while calling spcnv as one of its
   ! optional arugments.
-  integer(psb_ipk_), parameter :: psb_dupl_ovwrt_ = 0
-  integer(psb_ipk_), parameter :: psb_dupl_add_   = 1
+  integer(psb_ipk_), parameter :: psb_dupl_add_   = 0
+  integer(psb_ipk_), parameter :: psb_dupl_ovwrt_ = 1
   integer(psb_ipk_), parameter :: psb_dupl_err_   = 2
   integer(psb_ipk_), parameter :: psb_dupl_def_   = psb_dupl_add_
   ! Matrix update mode