diff --git a/base/modules/psb_base_mod.f90 b/base/modules/psb_base_mod.f90
index a2ccc48f..c3b8c152 100644
--- a/base/modules/psb_base_mod.f90
+++ b/base/modules/psb_base_mod.f90
@@ -30,6 +30,7 @@
 !!$  
 module psb_base_mod
   use psb_string_mod
+  use psb_check_mod
   use psb_error_mod
   use psb_penv_mod
   use psb_descriptor_type