diff --git a/lib/Internal/Posix/Runner.php b/lib/Internal/Posix/Runner.php
index 213341f..012e8d3 100644
--- a/lib/Internal/Posix/Runner.php
+++ b/lib/Internal/Posix/Runner.php
@@ -204,10 +204,13 @@ final class Runner implements ProcessRunner
     /** @inheritdoc */
     public function signal(ProcessHandle $handle, int $signo)
     {
-        /** @var Handle $handle */
-        if (!\proc_terminate($handle->proc, $signo)) {
-            throw new ProcessException("Sending signal to process failed");
-        }
+        $handle->pidDeferred->promise()->onResolve(function ($error, $pid) use ($signo) {
+            if ($error) {
+                return;
+            }
+
+            @\posix_kill($pid, $signo);
+        });
     }
 
     /** @inheritdoc */
diff --git a/test/ProcessTest.php b/test/ProcessTest.php
index 9c40e77..ee1c8d5 100644
--- a/test/ProcessTest.php
+++ b/test/ProcessTest.php
@@ -375,6 +375,17 @@ class ProcessTest extends TestCase
         });
     }
 
+    public function testSignal()
+    {
+        Loop::run(function () {
+            $process = new Process(["php", __DIR__ . "/bin/signal-process.php"]);
+            yield $process->start();
+            yield new Delayed(100); // Give process time to set up single handler.
+            $process->signal(\SIGTERM);
+            $this->assertSame(42, yield $process->join());
+        });
+    }
+
     public function testDebugInfo()
     {
         Loop::run(function () {