diff -Nru dpkg-1.14.20ubuntu6.1/debian/changelog dpkg-1.14.20ubuntu6.2/debian/changelog
--- dpkg-1.14.20ubuntu6.1/debian/changelog	2009-02-04 09:37:13.000000000 +0000
+++ dpkg-1.14.20ubuntu6.2/debian/changelog	2009-03-05 09:38:30.000000000 +0000
@@ -1,3 +1,11 @@
+dpkg (1.14.20ubuntu6.2) intrepid-proposed; urgency=low
+
+  * Backport from 1.14.21 (Raphael Hertzog):
+    - Fix dpkg-source to not use -i and -I by default with "1.0" source
+      packages. Closes: #495138, LP: #317761
+
+ -- Colin Watson <cjwatson@ubuntu.com>  Thu, 05 Mar 2009 09:37:38 +0000
+
 dpkg (1.14.20ubuntu6.1) intrepid-proposed; urgency=low
 
   * deal with dpkg database in inconsitent state
diff -Nru dpkg-1.14.20ubuntu6.1/scripts/Dpkg/Source/Package.pm dpkg-1.14.20ubuntu6.2/scripts/Dpkg/Source/Package.pm
--- dpkg-1.14.20ubuntu6.1/scripts/Dpkg/Source/Package.pm	2008-08-19 17:25:38.000000000 +0100
+++ dpkg-1.14.20ubuntu6.2/scripts/Dpkg/Source/Package.pm	2009-03-05 09:36:34.000000000 +0000
@@ -100,22 +100,27 @@
         'options' => {},
     };
     bless $self, $class;
+    if (exists $args{'options'}) {
+        $self->{'options'} = $args{'options'};
+    }
     if (exists $args{"filename"}) {
         $self->initialize($args{"filename"});
+        $self->init_options();
     }
-    if (exists $args{"options"}) {
-        $self->{'options'} = $args{'options'};
-    }
-    $self->init_options();
     return $self;
 }
 
 sub init_options {
     my ($self) = @_;
     # Use full ignore list by default
+    # note: this function is not called by V1 packages
     $self->{'options'}{'diff_ignore_regexp'} ||= $diff_ignore_default_regexp;
-    $self->{'options'}{'tar_ignore'} = [ @tar_ignore_default_pattern ]
+    if (defined $self->{'options'}{'tar_ignore'}) {
+        $self->{'options'}{'tar_ignore'} = [ @tar_ignore_default_pattern ]
             unless @{$self->{'options'}{'tar_ignore'}};
+    } else {
+        $self->{'options'}{'tar_ignore'} = [ @tar_ignore_default_pattern ];
+    }
 }
 
 sub initialize {