diff --git a/openbsc/src/meas_rep.c b/openbsc/src/meas_rep.c
index 4b9cc1a..8b5bff1 100644
--- a/openbsc/src/meas_rep.c
+++ b/openbsc/src/meas_rep.c
@@ -76,6 +76,9 @@
 	unsigned int i, idx;
 	int avg = 0;
 
+	if (num < 1)
+		return 0;
+
 	idx = calc_initial_idx(ARRAY_SIZE(lchan->meas_rep),
 				lchan->meas_rep_idx, num);