diff --git a/main.go b/main.go
index 30199f1..413453e 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,7 @@ type SlackConfig struct {
 
 // PostHandler send notifications from synology to slack
 func PostHandler(w http.ResponseWriter, r *http.Request) {
-        log.Printf(r.Header)
+        log.Printf(r.Header.Get)
 	if r.Header.Get("api_key") != appConfig.APIKey {
 		http.Error(w, "invalid api key", http.StatusUnauthorized)
 		log.Printf("invalid api key")