diff --git a/src/Monolog/Handler/AmqpHandler.php b/src/Monolog/Handler/AmqpHandler.php
index 833d72f9..8f0a2bab 100644
--- a/src/Monolog/Handler/AmqpHandler.php
+++ b/src/Monolog/Handler/AmqpHandler.php
@@ -65,7 +65,7 @@ class AmqpHandler extends AbstractProcessingHandler
                 0,
                 array(
                     'delivery_mode' => 2,
-                    'Content-type' => 'application/json',
+                    'content_type' => 'application/json',
                 )
             );
         } else {
diff --git a/tests/Monolog/Handler/AmqpHandlerTest.php b/tests/Monolog/Handler/AmqpHandlerTest.php
index 0ea5e725..8e0e7237 100644
--- a/tests/Monolog/Handler/AmqpHandlerTest.php
+++ b/tests/Monolog/Handler/AmqpHandlerTest.php
@@ -65,7 +65,7 @@ class AmqpHandlerTest extends TestCase
             0,
             array(
                 'delivery_mode' => 2,
-                'Content-type' => 'application/json',
+                'content_type' => 'application/json',
             ),
         );