diff --git a/solo b/solo
index 3265673..707ffec 100755
--- a/solo
+++ b/solo
@@ -1,23 +1,20 @@
 #!/usr/bin/perl -s
 #
-# solo v1.5
+# solo v1.7
 # Prevents multiple cron instances from running simultaneously.
 #
-# Copyright 2007-2010 Timothy Kay
+# Copyright 2007-2013 Timothy Kay
 # http://timkay.com/solo/
 #
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU General Public License as published by
-#    the Free Software Foundation, either version 3 of the License, or
-#    (at your option) any later version.
+# It is free software; you can redistribute it and/or modify it under the terms of either:
 #
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU General Public License for more details.
+# a) the GNU General Public License as published by the Free Software Foundation;
+#    either version 1 (http://dev.perl.org/licenses/gpl1.html), or (at your option)
+#    any later version (http://www.fsf.org/licenses/licenses.html#GNUGPL), or
 #
-#    You should have received a copy of the GNU General Public License
-#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# b) the "Artistic License" (http://dev.perl.org/licenses/artistic.html), or
+#
+# c) the MIT License (http://opensource.org/licenses/MIT)
 #
 
 use Socket;
@@ -39,4 +36,7 @@ if ($port)
 
 sleep $sleep if $sleep;
 
-exec @ARGV;
+unless(fork) {
+    exec @ARGV;
+}
+wait;
\ No newline at end of file