diff --git a/src/modules/mavlink/mavlink_log.c b/src/modules/mavlink/mavlink_log.c
index 1cf073fc8b..efa2e221ff 100644
--- a/src/modules/mavlink/mavlink_log.c
+++ b/src/modules/mavlink/mavlink_log.c
@@ -97,6 +97,14 @@ void mavlink_logbuffer_vasprintf(struct mavlink_logbuffer *lb, int severity, con
 	lb->elems[end].severity = severity;
 	vsnprintf(lb->elems[end].text, sizeof(lb->elems[0].text), fmt, ap);
 	va_end(ap);
+
+	/* increase count */
+	if (mavlink_logbuffer_is_full(lb)) {
+		lb->start = (lb->start + 1) % lb->size; /* full, overwrite */
+
+	} else {
+		++lb->count;
+	}
 }
 
 __EXPORT void mavlink_vasprintf(int _fd, int severity, const char *fmt, ...)