diff --git a/src/prec/psb_dprecbld.f90 b/src/prec/psb_dprecbld.f90
index fb572f4a..4f3a9e35 100644
--- a/src/prec/psb_dprecbld.f90
+++ b/src/prec/psb_dprecbld.f90
@@ -489,6 +489,7 @@ subroutine psb_umf_bld(a,desc_a,p,info)
   use psb_serial_mod
   use psb_descriptor_type
   use psb_prec_type
+  use psb_tools_mod
   use psb_const_mod
   implicit none