diff --git a/wifi/1.0/default/hidl_struct_util.cpp b/wifi/1.0/default/hidl_struct_util.cpp
index 485ae7e..5917efc 100644
--- a/wifi/1.0/default/hidl_struct_util.cpp
+++ b/wifi/1.0/default/hidl_struct_util.cpp
@@ -354,7 +354,10 @@
         hidl_scan_params.buckets[bucket_idx];
     legacy_hal::wifi_scan_bucket_spec& legacy_bucket_spec =
         legacy_scan_params->buckets[bucket_idx];
-    legacy_bucket_spec.bucket = bucket_idx;
+    if (hidl_bucket_spec.bucketIdx >= MAX_BUCKETS) {
+      return false;
+    }
+    legacy_bucket_spec.bucket = hidl_bucket_spec.bucketIdx;
     legacy_bucket_spec.band =
         convertHidlWifiBandToLegacy(hidl_bucket_spec.band);
     legacy_bucket_spec.period = hidl_bucket_spec.periodInMs;
diff --git a/wifi/1.0/types.hal b/wifi/1.0/types.hal
index 83e6660..d90d5be 100644
--- a/wifi/1.0/types.hal
+++ b/wifi/1.0/types.hal
@@ -320,6 +320,11 @@
  */
 struct StaBackgroundScanBucketParameters {
   /**
+   * Bucket index. This index is used to report results in
+   * |StaScanData.bucketsScanned|.
+   */
+  uint32_t bucketIdx;
+  /**
    * Bands to scan or |BAND_UNSPECIFIED| if frequencies list must be used
    * instead.
    */