diff --git a/command/agent/check.go b/command/agent/check.go
index c3210f7b64f2..87de9681062f 100644
--- a/command/agent/check.go
+++ b/command/agent/check.go
@@ -391,6 +391,7 @@ func (c *CheckHTTP) check() {
 	}
 
 	req.Header.Set("User-Agent", HttpUserAgent)
+	req.Header.Set("Accept", "text/plain, text/*, */*")
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {