diff --git a/hal/audio_extn/usb.c b/hal/audio_extn/usb.c
index e6859fe..911724a 100644
--- a/hal/audio_extn/usb.c
+++ b/hal/audio_extn/usb.c
@@ -395,6 +395,7 @@
         return -1;
     }
     memcpy(tmp, interval_str_start, eol-interval_str_start);
+    tmp[eol-interval_str_start] = '\0';
     sscanf(tmp, "%lu %2s", &interval, &time_unit[0]);
     if (!strcmp(time_unit, "us")) {
         multiplier = 1;