diff --git a/include/osmocom/msc/debug.h b/include/osmocom/msc/debug.h
index 28ba482..3347e20 100644
--- a/include/osmocom/msc/debug.h
+++ b/include/osmocom/msc/debug.h
@@ -22,5 +22,6 @@
 	DIUCS,
 	DBSSAP,
 	DSGS,
+	DSS,
 	Debug_LastEntry,
 };
diff --git a/include/osmocom/msc/transaction.h b/include/osmocom/msc/transaction.h
index 6b82390..c63ef5b 100644
--- a/include/osmocom/msc/transaction.h
+++ b/include/osmocom/msc/transaction.h
@@ -168,10 +168,7 @@
 	case TRANS_SMS:
 		return DLSMS;
 	case TRANS_USSD:
-		/* FIXME: traditionally (before LOG_TRANS() was added in I2e60964d7a3c06d051debd1c707051a0eb3101ba /
-		 * ff7074a0c7b62025473d8f1a950905ac2cb2f31c), all USSD logging happened on DMM. Instead, it probably
-		 * deserves its own logging subsystem. */
-		return DMM;
+		return DSS;
 	default:
 		break;
 	}