diff --git a/openbsc/include/openbsc/chan_alloc.h b/openbsc/include/openbsc/chan_alloc.h
index f2d3c78..4fc0b83 100644
--- a/openbsc/include/openbsc/chan_alloc.h
+++ b/openbsc/include/openbsc/chan_alloc.h
@@ -54,7 +54,7 @@
 };
 
 struct pchan_load {
-	struct load_counter pchan[GSM_PCHAN_UNKNOWN];
+	struct load_counter pchan[_GSM_PCHAN_MAX];
 };
 
 void bts_chan_load(struct pchan_load *cl, const struct gsm_bts *bts);