diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index a675242971..201562521f 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -816,7 +816,7 @@ typedef enum
  */
 typedef enum
 {
-	WAIT_EVENT_BUFFILE_READ,
+	WAIT_EVENT_BUFFILE_READ = PG_WAIT_IO,
 	WAIT_EVENT_BUFFILE_WRITE,
 	WAIT_EVENT_CONTROL_FILE_READ,
 	WAIT_EVENT_CONTROL_FILE_SYNC,
@@ -829,7 +829,7 @@ typedef enum
 	WAIT_EVENT_DATA_FILE_FLUSH,
 	WAIT_EVENT_DATA_FILE_IMMEDIATE_SYNC,
 	WAIT_EVENT_DATA_FILE_PREFETCH,
-	WAIT_EVENT_DATA_FILE_READ = PG_WAIT_IO,
+	WAIT_EVENT_DATA_FILE_READ,
 	WAIT_EVENT_DATA_FILE_SYNC,
 	WAIT_EVENT_DATA_FILE_TRUNCATE,
 	WAIT_EVENT_DATA_FILE_WRITE,