diff --git a/support/proxy/http.d/ratelimit.conf b/support/proxy/http.d/ratelimit.conf
index a701bcec..2d1dd46a 100644
--- a/support/proxy/http.d/ratelimit.conf
+++ b/support/proxy/http.d/ratelimit.conf
@@ -11,4 +11,4 @@ map $status $retry_after {
     # Time (in seconds) client should wait before retry
     429 '120';
 }
-add_header Retry_After $retry_after always;
+add_header Retry-After $retry_after always;