diff --git a/src/mailers.c b/src/mailers.c
index 80dc7d6f6..3df02f0f5 100644
--- a/src/mailers.c
+++ b/src/mailers.c
@@ -237,7 +237,7 @@ static int enqueue_one_email_alert(struct proxy *p, struct server *s,
 			"From: ", p->email_alert.from, "\r\n",
 			"To: ", p->email_alert.to, "\r\n",
 			"Date: ", datestr, "\r\n",
-			"Subject: [HAproxy Alert] ", msg, "\r\n",
+			"Subject: [HAProxy Alert] ", msg, "\r\n",
 			"\r\n",
 			msg, "\r\n",
 			"\r\n",