diff --git a/lib/KorAP/XML/Archive.pm b/lib/KorAP/XML/Archive.pm
index 5dd6855..58a8731 100644
--- a/lib/KorAP/XML/Archive.pm
+++ b/lib/KorAP/XML/Archive.pm
@@ -146,7 +146,7 @@
   my @init_cmd = (
     'unzip',          # Use unzip program
     '-qo',            # quietly overwrite all existing files
-    '-o',
+    '-u',
     '-d', $target_dir # Extract into target directory
   );
 
@@ -172,6 +172,7 @@
   # Only single call
   if (!$jobs || $jobs == 1) {
     foreach (@cmds) {
+
       system(@$_);
 
       # Check for return code
@@ -198,8 +199,9 @@
     foreach my $cmd (@cmds) {
       my $pid = $pool->start and next ARCHIVE_LOOP;
       system(@$cmd);
+      my $code = $?;
       my $last = $cmd->[4];
-      $pool->finish($?, \"$last");
+      $pool->finish($code, \"$last");
     };
     $pool->wait_all_children;
   };
@@ -220,7 +222,7 @@
   my @init_cmd = (
     'unzip',          # Use unzip program
     '-qo',            # quietly overwrite all existing files
-    '-o',
+    '-u',
     '-d', $target_dir # Extract into target directory
   );
 
@@ -278,7 +280,7 @@
   my @init_cmd = (
     'unzip',          # Use unzip program
     '-qo',            # quietly overwrite all existing files
-    '-o',
+    '-u',
     '-d', $target_dir # Extract into target directory
   );
 
diff --git a/lib/KorAP/XML/Krill.pm b/lib/KorAP/XML/Krill.pm
index 8e5ae8f..e94baaa 100644
--- a/lib/KorAP/XML/Krill.pm
+++ b/lib/KorAP/XML/Krill.pm
@@ -16,7 +16,7 @@
 use Data::Dumper;
 use File::Spec::Functions qw/catdir catfile catpath splitdir splitpath rel2abs/;
 
-our $VERSION = '0.27';
+our $VERSION = '0.28';
 
 has 'path';
 has [qw/text_sigle doc_sigle corpus_sigle/];