diff --git a/prec/psb_c_prec_type.f90 b/prec/psb_c_prec_type.f90
index dea15741..a0aad152 100644
--- a/prec/psb_c_prec_type.f90
+++ b/prec/psb_c_prec_type.f90
@@ -386,6 +386,7 @@ contains
   end subroutine psb_c_prec_free
 
   function psb_cprec_sizeof(prec, global) result(val)
+    use psb_base_mod, only : psb_sum
     implicit none 
     class(psb_cprec_type), intent(in) :: prec
     logical, intent(in), optional :: global
diff --git a/prec/psb_d_prec_type.f90 b/prec/psb_d_prec_type.f90
index 54ddd992..9b8545aa 100644
--- a/prec/psb_d_prec_type.f90
+++ b/prec/psb_d_prec_type.f90
@@ -386,6 +386,7 @@ contains
   end subroutine psb_d_prec_free
 
   function psb_dprec_sizeof(prec, global) result(val)
+    use psb_base_mod, only : psb_sum
     implicit none 
     class(psb_dprec_type), intent(in) :: prec
     logical, intent(in), optional :: global
diff --git a/prec/psb_s_prec_type.f90 b/prec/psb_s_prec_type.f90
index 255f40cc..5f0af892 100644
--- a/prec/psb_s_prec_type.f90
+++ b/prec/psb_s_prec_type.f90
@@ -386,6 +386,7 @@ contains
   end subroutine psb_s_prec_free
 
   function psb_sprec_sizeof(prec, global) result(val)
+    use psb_base_mod, only : psb_sum
     implicit none 
     class(psb_sprec_type), intent(in) :: prec
     logical, intent(in), optional :: global
diff --git a/prec/psb_z_prec_type.f90 b/prec/psb_z_prec_type.f90
index a6039032..ab4f4e26 100644
--- a/prec/psb_z_prec_type.f90
+++ b/prec/psb_z_prec_type.f90
@@ -386,6 +386,7 @@ contains
   end subroutine psb_z_prec_free
 
   function psb_zprec_sizeof(prec, global) result(val)
+    use psb_base_mod, only : psb_sum
     implicit none 
     class(psb_zprec_type), intent(in) :: prec
     logical, intent(in), optional :: global