diff --git a/404main b/404main
index 3f3bb8f..9301f70 100755
--- a/404main
+++ b/404main
@@ -112,7 +112,7 @@ def main():
     # Check if the amount of arguments is correct
     if len(sys.argv) < 2 or len(sys.argv) > 3 or sys.argv[1] in ('help', '-h', '--help'):
         print 'Usage: %s <package name> [<distribution>]' % sys.argv[0]
-        sys.exit(1)
+        sys.exit(0)
 
         cache = apt.cache.Cache()
 
diff --git a/debian/changelog b/debian/changelog
index bda6af3..105f335 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -16,6 +16,8 @@ ubuntu-dev-tools (0.109) UNRELEASED; urgency=low
   * Add the beginnings of a test suite. (LP: #690386)
     - Switch to setuptools, to support setup.py test.
     - Test for that every script can run --help and return 0.
+    - 404main, merge-changelog, pull-debian-debdiff, pull-debian-source:
+      Return 0 after showing help.
   * ubuntutools/common.py: Remove https_proxy unsetting code, working around
     LP: #94130.
 
@@ -30,7 +32,7 @@ ubuntu-dev-tools (0.109) UNRELEASED; urgency=low
     - Fix 'str' object has no attribute 'startwith' crash caused by a typo.
     - Fix crash if uploading to ubuntu without building the package before.
 
- -- Stefano Rivera <stefanor@ubuntu.com>  Wed, 22 Dec 2010 15:02:45 +0200
+ -- Stefano Rivera <stefanor@ubuntu.com>  Wed, 22 Dec 2010 16:52:55 +0200
 
 ubuntu-dev-tools (0.108) experimental; urgency=low
 
diff --git a/merge-changelog b/merge-changelog
index 29e2d8a..d9f97fc 100755
--- a/merge-changelog
+++ b/merge-changelog
@@ -20,7 +20,7 @@
 
 import sys, re
 
-def usage():
+def usage(exit=1):
     print '''Usage: merge-changelog <left changelog> <right changelog>
 
 merge-changelog takes two changelogs that once shared a common source,
@@ -28,7 +28,7 @@ merges them back together, and prints the merged result to stdout.  This
 is useful if you need to manually merge a ubuntu package with a new
 Debian release of the package.
 '''
-    sys.exit(1)
+    sys.exit(0)
 
 ########################################################################
 # Changelog Management
@@ -253,8 +253,10 @@ def deb_cmp(x, y):
 
 
 if __name__ == '__main__':
+    if len(sys.argv) > 1 and sys.argv[1] in ('-h', '--help'):
+        usage(exit=0)
     if len(sys.argv) != 3:
-        usage()
+        usage(exit=1)
 
     left_changelog = sys.argv[1]
     right_changelog = sys.argv[2]
diff --git a/pull-debian-debdiff b/pull-debian-debdiff
index bd5389f..e9e3e92 100755
--- a/pull-debian-debdiff
+++ b/pull-debian-debdiff
@@ -115,6 +115,13 @@ sub download_source
     return 1;
 }
 
+sub usage
+{
+    my ($exit) = @_;
+    print "Usage: $0 PKG VERSION\n";
+    exit $exit;
+}
+
 
 
 my $pkg = $ARGV[0];
@@ -123,8 +130,10 @@ my $just_fetch = ($ARGV[2] && $ARGV[2] eq "--fetch");
 my $skip = $ARGV[2] || 1;
 $skip+=0;
 
-if (!defined($pkg) || !defined($version)) {
-    die "Usage: $0 PKG VERSION\n";
+if (defined($pkg) && ($pkg eq '--help' || $pkg eq '-h')) {
+    usage(0);
+} elsif (!defined($pkg) || !defined($version)) {
+    usage(2);
 }
 
 
diff --git a/pull-debian-source b/pull-debian-source
index aba22c8..297324f 100755
--- a/pull-debian-source
+++ b/pull-debian-source
@@ -27,10 +27,10 @@ use AptPkg::Version;
 die("Please install 'devscripts'\n") if(! grep -x "$_/dget", split(':',$ENV{'PATH'}));
 
 my($name)=basename($0);
-my($package)=$ARGV[0] || &usage();
+my($package)=$ARGV[0] || &usage(2);
 my($help)=0;
 GetOptions('help' => \$help);
-&usage() if($help);
+&usage(0) if($help);
 my($release)=$ARGV[1] || 'unstable';
 $release=&convertCodeName($release);
 &checkRelease($release);
@@ -132,7 +132,9 @@ sub getDSC {
 
 }
 sub usage {
-	die("USAGE: $name [-h] <source package> [target release]\n");
+	my($exit)=shift;
+	print("USAGE: $name [-h] <source package> [target release]\n");
+	exit($exit);
 }
 sub invalidRelease {
 	my($releases)=shift || die("Invalid Release!");
diff --git a/ubuntutools/test/test_help.py b/ubuntutools/test/test_help.py
index a6812cf..f2ec524 100644
--- a/ubuntutools/test/test_help.py
+++ b/ubuntutools/test/test_help.py
@@ -25,17 +25,13 @@ import setup
 from ubuntutools.test import unittest
 
 BLACKLIST = {
-    '404main': 'Returns non-zero after help',
     'check-symbols': 'No Help',
     'edit-patch': 'No Help',
     'grep-merges': 'No Help',
     'lp-project-upload': 'Returns non-zero after help. Leaving u-d-t in LP: #524680',
     'massfile': 'No Help. Leaves files in .',
-    'merge-changelog': 'Returns non-zero after help',
     'mk-sbuild': 'Fires up apt-get before showing help',
     'pbuilder-dist-simple': 'No Help',
-    'pull-debian-debdiff': 'Returns non-zero after help',
-    'pull-debian-source': 'Returns non-zero after help',
     'pull-revu-source': 'Throws Error',
     'setup-packaging-environment': 'Throws Error',
     'submittodebian': 'No Help',