diff --git a/src/NativeSender.php b/src/NativeSender.php
index fe1f2d0..9d1c143 100644
--- a/src/NativeSender.php
+++ b/src/NativeSender.php
@@ -83,8 +83,8 @@ private function buildRequest(Request $smartyRequest)
         if ($smartyRequest->getReferer() != null)
             curl_setopt($ch, CURLOPT_REFERER, $smartyRequest->getReferer());
         if ($this->ip != null) {
-            curl_setopt($ch, CURLOPT_HTTPHEADER, array("X_FORWARDED_FOR: $this->ip"));
-            $smartyRequest->setHeader('X_FORWARDED_FOR', $this->ip);
+            curl_setopt($ch, CURLOPT_HTTPHEADER, array("X-Forwarded-For: $this->ip"));
+            $smartyRequest->setHeader('X-Forwarded-For', $this->ip);
         }
 
         return $ch;
diff --git a/tests/XForwardedForTest.php b/tests/XForwardedForTest.php
index 8b4c0e4..39b6ced 100644
--- a/tests/XForwardedForTest.php
+++ b/tests/XForwardedForTest.php
@@ -23,7 +23,7 @@ public function testNativeSetOnQuery() {
 
         $sender->send($request);
 
-        $this->assertEquals("0.0.0.0", $request->getHeaders()["X_FORWARDED_FOR"]);
+        $this->assertEquals("0.0.0.0", $request->getHeaders()["X-Forwarded-For"]);
     }
 
     public function testNativeNotSet() {
@@ -34,6 +34,6 @@ public function testNativeNotSet() {
         $sender->send($request);
         $headers = $request->getHeaders();
 
-        $this->assertEquals(false, array_key_exists("X_FORWARDED_FOR", $headers));
+        $this->assertEquals(false, array_key_exists("X-Forwarded-For", $headers));
     }
 }
\ No newline at end of file