diff --git a/files/routes/awards.py b/files/routes/awards.py
index 469f5f96d..c8ec96175 100644
--- a/files/routes/awards.py
+++ b/files/routes/awards.py
@@ -312,6 +312,9 @@ def award_thing(v, thing_type, id):
 	elif kind == "progressivestack":
 		if not FEATURES['PINS']:
 			abort(403)
+
+		if author.id in BOOSTED_USERS: abort(409, f"This user is already permanently progressive-stacked!")
+
 		if author.progressivestack: author.progressivestack += 21600
 		else: author.progressivestack = int(time.time()) + 21600
 		badge_grant(user=author, badge_id=94)