diff --git a/contrib/pg_upgrade/controldata.c b/contrib/pg_upgrade/controldata.c
index 2a4b636245f..6ce5145eebd 100644
--- a/contrib/pg_upgrade/controldata.c
+++ b/contrib/pg_upgrade/controldata.c
@@ -585,7 +585,7 @@ check_control_data(ControlData *oldctrl,
 
 	if (oldctrl->largesz == 0 || oldctrl->largesz != newctrl->largesz)
 		pg_log(PG_FATAL,
-			   "old and new pg_controldata maximum relation segement sizes are invalid or do not match\n");
+			   "old and new pg_controldata maximum relation segment sizes are invalid or do not match\n");
 
 	if (oldctrl->walsz == 0 || oldctrl->walsz != newctrl->walsz)
 		pg_log(PG_FATAL,