diff --git a/src/bin/pg_upgrade/controldata.c b/src/bin/pg_upgrade/controldata.c
index 8da4ce3ccc..dcbad611f3 100644
--- a/src/bin/pg_upgrade/controldata.c
+++ b/src/bin/pg_upgrade/controldata.c
@@ -539,7 +539,7 @@ check_control_data(ControlData *oldctrl,
 		pg_fatal("old and new pg_controldata block sizes are invalid or do not match\n");
 
 	if (oldctrl->largesz == 0 || oldctrl->largesz != newctrl->largesz)
-		pg_fatal("old and new pg_controldata maximum relation segement sizes are invalid or do not match\n");
+		pg_fatal("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_fatal("old and new pg_controldata WAL block sizes are invalid or do not match\n");