diff --git a/base/modules/psb_const_mod.f90 b/base/modules/psb_const_mod.f90
index 25f867ca..64f3755b 100644
--- a/base/modules/psb_const_mod.f90
+++ b/base/modules/psb_const_mod.f90
@@ -38,7 +38,7 @@ module psb_const_mod
   real(kind(1.d0)), parameter    :: dzero=0.d0, done=1.d0
   complex(kind(1.d0)), parameter :: zzero=(0.d0,0.0d0)
   complex(kind(1.d0)), parameter :: zone=(1.d0,0.0d0)
-  real(kind(1.d0)), parameter    :: epstol=1.d-32
+  real(kind(1.d0)), parameter    :: epstol=1.d-32, psb_percent_=0.7
 
   character, parameter :: psb_all_='A',  psb_topdef_=' '