diff --git a/src/w_wad.c b/src/w_wad.c
index bc5473eab..b67974a10 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -1683,7 +1683,8 @@ int W_VerifyNMUSlumps(const char *filename)
 		{"TTL", 3}, // Act number changes
 		{"STCFN", 5}, // Console font changes
 		{"TNYFN", 5}, // Tiny console font changes
-		{"STT", 3}, // Acceptable HUD changes (Score Time Rings)
+		{"SBO", 3}, // Acceptable HUD changes (Score Time Rings)
+		{"RRINGS", 6}, // Rings HUD (not named as SBO)
 		{"YB_", 3}, // Intermission graphics, goes with the above
 		{"M_", 2}, // As does menu stuff