diff --git a/src/Jaeger/Senders/HttpSender.cs b/src/Jaeger/Senders/HttpSender.cs
index 31bff8179..488e75b0e 100644
--- a/src/Jaeger/Senders/HttpSender.cs
+++ b/src/Jaeger/Senders/HttpSender.cs
@@ -42,7 +42,7 @@ private HttpSender(Builder builder)
             var customHeaders = new Dictionary<string, string>();
             if (builder.AuthenticationHeaderValue != null)
             {
-                customHeaders.Add("Authorize", builder.AuthenticationHeaderValue.ToString());
+                customHeaders.Add("Authorization", builder.AuthenticationHeaderValue.ToString());
             }
 
             _transport = new THttpClientTransport(collectorUri, customHeaders);