diff --git a/openbsc/src/libbsc/abis_nm.c b/openbsc/src/libbsc/abis_nm.c
index b74e772..adc2362 100644
--- a/openbsc/src/libbsc/abis_nm.c
+++ b/openbsc/src/libbsc/abis_nm.c
@@ -1507,7 +1507,7 @@
 
 			/* not on the same TRX that has a BCCH+SDCCH4
 			 * combination */
-			if (ts->trx == ts->trx->bts->c0 &&
+			if (ts->trx != ts->trx->bts->c0 &&
 			    (ts->trx->ts[0].nm_chan_comb == 5 ||
 			     ts->trx->ts[0].nm_chan_comb == 8)) {
 				*reason = "SDCCH/8 and BCCH must be on the same TRX.";