diff --git a/src/gsm/gsm0480.c b/src/gsm/gsm0480.c
index fdec3d2..4d87974 100644
--- a/src/gsm/gsm0480.c
+++ b/src/gsm/gsm0480.c
@@ -430,6 +430,8 @@
 		uint8_t operation_code = invoke_data[offset+2];
 		req->opcode = operation_code;
 		switch (operation_code) {
+		case GSM0480_OP_CODE_USS_NOTIFY:
+		case GSM0480_OP_CODE_USS_REQUEST:
 		case GSM0480_OP_CODE_PROCESS_USS_REQ:
 			rc = parse_process_uss_req(invoke_data + offset + 3,
 						   length - offset - 3,