diff --git a/SignalRegistry/SignalMap.php b/SignalRegistry/SignalMap.php
index de419bda7..2f9aa67c1 100644
--- a/SignalRegistry/SignalMap.php
+++ b/SignalRegistry/SignalMap.php
@@ -27,7 +27,7 @@ public static function getSignalName(int $signal): ?string
         if (!isset(self::$map)) {
             $r = new \ReflectionExtension('pcntl');
             $c = $r->getConstants();
-            $map = array_filter($c, fn ($k) => str_starts_with($k, 'SIG') && !str_starts_with($k, 'SIG_'), \ARRAY_FILTER_USE_KEY);
+            $map = array_filter($c, fn ($k) => str_starts_with($k, 'SIG') && !str_starts_with($k, 'SIG_') && 'SIGBABY' !== $k, \ARRAY_FILTER_USE_KEY);
             self::$map = array_flip($map);
         }
 
diff --git a/Tests/SignalRegistry/SignalMapTest.php b/Tests/SignalRegistry/SignalMapTest.php
index 887c5d7af..f4e320477 100644
--- a/Tests/SignalRegistry/SignalMapTest.php
+++ b/Tests/SignalRegistry/SignalMapTest.php
@@ -22,6 +22,7 @@ class SignalMapTest extends TestCase
      * @testWith [2, "SIGINT"]
      *           [9, "SIGKILL"]
      *           [15, "SIGTERM"]
+     *           [31, "SIGSYS"]
      */
     public function testSignalExists(int $signal, string $expected)
     {