1 files changed, 5 insertions, 1 deletions
diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index f68ebd2..112d15b 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -93,8 +93,12 @@ sub enabledebug () {
 }
     
 sub enabledebuglevel ($) {
+    my ($newlevel) = @_; # may be undef (eg from env var)
     die if $debuglevel;
-    $debuglevel = $_[0] + 0;
+    $newlevel //= 0;
+    $newlevel += 0;
+    return unless $newlevel;
+    $debuglevel = $newlevel;
     enabledebug();
 }