diff --git a/external/ezfio b/external/ezfio
index dba01c4f..d02132ea 160000
--- a/external/ezfio
+++ b/external/ezfio
@@ -1 +1 @@
-Subproject commit dba01c4fe0ff7b84c5ecfb1c7c77ec68781311b3
+Subproject commit d02132ea79217c16fd24242e8f8b8a6c3ff68091
diff --git a/src/determinants/spindeterminants.irp.f b/src/determinants/spindeterminants.irp.f
index 87c5d360..01979c02 100644
--- a/src/determinants/spindeterminants.irp.f
+++ b/src/determinants/spindeterminants.irp.f
@@ -14,7 +14,7 @@ integer*8 function spin_det_search_key(det,Nint)
   END_DOC
   integer, intent(in) :: Nint
   integer(bit_kind), intent(in) :: det(Nint)
-  integer(bit_kind), parameter :: unsigned_shift = -huge(1_bit_kind) ! 100...00
+  integer(bit_kind), parameter :: unsigned_shift = 1_bit_kind-huge(1_bit_kind) ! 100...00
   integer :: i
   spin_det_search_key = det(1)
   do i=2,Nint