diff --git a/src/Formatter/Cron.php b/src/Formatter/Cron.php
index 682bf51..814e8bf 100644
--- a/src/Formatter/Cron.php
+++ b/src/Formatter/Cron.php
@@ -11,7 +11,9 @@ class Cron
 
     public function header(): Header
     {
-        $this->header = new Header($this);
+        if ($this->header === null) {
+            $this->header = new Header($this);
+        }
 
         return $this->header;
     }
diff --git a/tests/Formatter/CronTest.php b/tests/Formatter/CronTest.php
index 2997a66..de084ed 100644
--- a/tests/Formatter/CronTest.php
+++ b/tests/Formatter/CronTest.php
@@ -65,4 +65,25 @@ public function shouldBuildConfiguration(): void
 
         $this->assertEquals($expected, $this->cron->format());
     }
+
+    /** @test */
+    public function headerShouldReturnSameInstance(): void
+    {
+        $h1 = $this->cron->header();
+        $h2 = $this->cron->header();
+
+        $this->assertSame($h1, $h2);
+    }
+
+    /** @test */
+    public function headerShouldNotLoseStateWhenCalledMultipleTimes(): void
+    {
+        $this->cron->header()->setPath('path')->end();
+        $this->cron->header()->setMailto('test@example.com')->end();
+
+        $output = $this->cron->format();
+
+        $this->assertStringContainsString("PATH=path", $output);
+        $this->assertStringContainsString("MAILTO=test@example.com", $output);
+    }
 }