diff --git a/scripts/daemon/launch_daemon.php b/scripts/daemon/launch_daemon.php
--- a/scripts/daemon/launch_daemon.php
+++ b/scripts/daemon/launch_daemon.php
@@ -5,7 +5,11 @@
 // script, except it loads the Phabricator environment and adds some Phabricator
 // specific flags.
 
-declare(ticks = 1);
+if (function_exists('pcntl_async_signals')) {
+  pcntl_async_signals(true);
+} else {
+  declare(ticks = 1);
+}
 
 $root = dirname(dirname(dirname(__FILE__)));
 require_once $root.'/scripts/__init_script__.php';
diff --git a/scripts/ssh/ssh-connect.php b/scripts/ssh/ssh-connect.php
--- a/scripts/ssh/ssh-connect.php
+++ b/scripts/ssh/ssh-connect.php
@@ -7,7 +7,11 @@
 // In some cases, Subversion sends us SIGTERM. If we don't catch the signal and
 // react to it, we won't run object destructors by default and thus won't clean
 // up temporary files. Declare ticks so we can install a signal handler.
-declare(ticks=1);
+if (function_exists('pcntl_async_signals')) {
+  pcntl_async_signals(true);
+} else {
+  declare(ticks = 1);
+}
 
 $root = dirname(dirname(dirname(__FILE__)));
 require_once $root.'/scripts/__init_script__.php';