diff --git a/alerting/provider/slack/slack.go b/alerting/provider/slack/slack.go
index dcee7d6b..df2c26a6 100644
--- a/alerting/provider/slack/slack.go
+++ b/alerting/provider/slack/slack.go
@@ -43,7 +43,7 @@ func (provider *AlertProvider) IsValid() bool {
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
-	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(endpoint, alert, result, resolved)))
+	buffer := bytes.NewBuffer(provider.buildRequestBody(endpoint, alert, result, resolved))
 	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(endpoint.Group), buffer)
 	if err != nil {
 		return err