diff --git a/openbsc/src/libbsc/bsc_ctrl_commands.c b/openbsc/src/libbsc/bsc_ctrl_commands.c
index 36eda35..aea4a9b 100644
--- a/openbsc/src/libbsc/bsc_ctrl_commands.c
+++ b/openbsc/src/libbsc/bsc_ctrl_commands.c
@@ -248,6 +248,8 @@
 			continue;
 		if (i == GSM_PCHAN_PDCH)
 			continue;
+		if (i == GSM_PCHAN_UNKNOWN)
+			continue;
 
 		cmd->reply = talloc_asprintf_append(cmd->reply,
 					"%s%s,%u,%u",