diff --git a/openbsc/src/bsc_init.c b/openbsc/src/bsc_init.c
index fa4d858..55bb882 100644
--- a/openbsc/src/bsc_init.c
+++ b/openbsc/src/bsc_init.c
@@ -981,6 +981,8 @@
 {
 	int i, n;
 
+	/* FIXME: What about secondary TRX of a BTS?  What about a BTS that has TRX
+	 * in different bands? Why is 'band' a parameter of the BTS and not of the TRX? */
 	switch (bts->band) {
 	case GSM_BAND_1800:
 		if (bts->c0->arfcn < 512 || bts->c0->arfcn > 885) {
@@ -1002,6 +1004,12 @@
 			return -EINVAL;
 		}
 		break;
+	case GSM_BAND_850:
+		if (bts->c0->arfcn < 128 || bts->c0->arfcn > 251) {
+			LOGP(DNM, LOGL_ERROR, "GSM850 channel must be between 128-251.\n");
+			return -EINVAL;
+		}
+		break;
 	default:
 		LOGP(DNM, LOGL_ERROR, "Unsupported frequency band.\n");
 		return -EINVAL;