diff --git a/C4/Items.pm b/C4/Items.pm
index 70af5ef98d..1ce54361f6 100644
--- a/C4/Items.pm
+++ b/C4/Items.pm
@@ -459,7 +459,7 @@ my %default_values_for_mod_from_marc = (
     itemnotes            => undef, 
     itype                => undef, 
     location             => undef, 
-    permanent_location   => undef,
+#    permanent_location   => undef, # "undef" counts as "exists" which disrupts proper handling of location and permanent_location in _do_column_fixes_for_mod()
     materials            => undef, 
     notforloan           => 0,
     paidfor              => undef,