diff --git a/aosp/metrics_reporter_android.cc b/aosp/metrics_reporter_android.cc
index ea3bb6d..22ebf0d 100644
--- a/aosp/metrics_reporter_android.cc
+++ b/aosp/metrics_reporter_android.cc
@@ -61,7 +61,6 @@
 }  // namespace metrics
 
 void MetricsReporterAndroid::ReportUpdateAttemptMetrics(
-    SystemState* /* system_state */,
     int attempt_number,
     PayloadType payload_type,
     base::TimeDelta duration,
diff --git a/aosp/metrics_reporter_android.h b/aosp/metrics_reporter_android.h
index 4a173bf..729542e 100644
--- a/aosp/metrics_reporter_android.h
+++ b/aosp/metrics_reporter_android.h
@@ -39,13 +39,11 @@
   void ReportDailyMetrics(base::TimeDelta os_age) override {}
 
   void ReportUpdateCheckMetrics(
-      SystemState* system_state,
       metrics::CheckResult result,
       metrics::CheckReaction reaction,
       metrics::DownloadErrorCode download_error_code) override {}
 
-  void ReportUpdateAttemptMetrics(SystemState* system_state,
-                                  int attempt_number,
+  void ReportUpdateAttemptMetrics(int attempt_number,
                                   PayloadType payload_type,
                                   base::TimeDelta duration,
                                   base::TimeDelta duration_uptime,
diff --git a/aosp/update_attempter_android.cc b/aosp/update_attempter_android.cc
index 57430fe..d48293a 100644
--- a/aosp/update_attempter_android.cc
+++ b/aosp/update_attempter_android.cc
@@ -733,7 +733,6 @@
       std::make_unique<DownloadAction>(prefs_,
                                        boot_control_,
                                        hardware_,
-                                       nullptr,  // system_state, not used.
                                        fetcher,  // passes ownership
                                        true /* interactive */);
   download_action->set_delegate(this);
@@ -804,7 +803,6 @@
   TimeDelta duration_uptime = clock_->GetMonotonicTime() - monotonic_time_start;
 
   metrics_reporter_->ReportUpdateAttemptMetrics(
-      nullptr,  // system_state
       static_cast<int>(attempt_number),
       payload_type,
       duration,
diff --git a/aosp/update_attempter_android_unittest.cc b/aosp/update_attempter_android_unittest.cc
index bb44450..fc30268 100644
--- a/aosp/update_attempter_android_unittest.cc
+++ b/aosp/update_attempter_android_unittest.cc
@@ -138,8 +138,7 @@
   TimeDelta duration_uptime = up_time - Time::FromInternalValue(12345);
   EXPECT_CALL(
       *metrics_reporter_,
-      ReportUpdateAttemptMetrics(_,
-                                 2,
+      ReportUpdateAttemptMetrics(2,
                                  _,
                                  duration,
                                  duration_uptime,