diff --git a/33128/r18/TS33128Payloads.asn b/33128/r18/TS33128Payloads.asn
index b49f126736f8629551013e9934837ddd84ac7ffe..dc2fefbc522a25e136d643d99e2ca00d6e78377a 100644
--- a/33128/r18/TS33128Payloads.asn
+++ b/33128/r18/TS33128Payloads.asn
@@ -7401,7 +7401,7 @@ UTRANPositioningInfo ::= SEQUENCE
 {
     uTRANPositioningData           [1] UTRANPositioningData OPTIONAL,
     uTRANGANSSPositioningData      [2] UTRANGANSSPositioningData OPTIONAL,
-    uTRANAdditionalPositioningData [3] UTRANAdditionalPositioningData
+    uTRANAdditionalPositioningData [3] UTRANAdditionalPositioningData OPTIONAL
 }
 
 -- TS 29.172 [53], clause 7.4.33