diff --git a/lib/includes/spdylay/spdylay.h b/lib/includes/spdylay/spdylay.h
index 0fc3a37d..ff6996c2 100644
--- a/lib/includes/spdylay/spdylay.h
+++ b/lib/includes/spdylay/spdylay.h
@@ -332,15 +332,13 @@ typedef enum {
    * SETTINGS_CLIENT_CERTIFICATE_VECTOR_SIZE. This first appeared in
    * SPDY/3.
    */
-  SPDYLAY_SETTINGS_CLIENT_CERTIFICATE_VECTOR_SIZE = 8
+  SPDYLAY_SETTINGS_CLIENT_CERTIFICATE_VECTOR_SIZE = 8,
+  /**
+   * Maximum ID of :type:`spdylay_settings_id`.
+   */
+  SPDYLAY_SETTINGS_MAX = 8
 } spdylay_settings_id;
 
-/**
- * @macro
- * Maximum ID of :type:`spdylay_settings_id`.
- */
-#define SPDYLAY_SETTINGS_MAX 8
-
 /**
  * @macro
  * Default maximum concurrent streams.