diff --git a/33128/r19/TS33128Payloads.asn b/33128/r19/TS33128Payloads.asn
index 0f5bcb467fc871be5b29f60ba403330eecfbf875..e10f6ae0cd61a1fea843d7ad9deade3fb63e5928 100644
--- a/33128/r19/TS33128Payloads.asn
+++ b/33128/r19/TS33128Payloads.asn
@@ -8337,7 +8337,7 @@ 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