diff --git a/metrics/metrics_daemon.cc b/metrics/metrics_daemon.cc
index b8d013d..5f9d851 100644
--- a/metrics/metrics_daemon.cc
+++ b/metrics/metrics_daemon.cc
@@ -495,7 +495,7 @@
     LOG_IF(WARNING, nchars == sizeof(line))
         << "line too long in " << diskstats_path_;
     line[nchars] = '\0';
-    nitems = sscanf(line, "%*d %*d %" PRIu64 "d %*d %*d %*d %" PRIu64 "d",
+    nitems = sscanf(line, "%*d %*d %" PRIu64 " %*d %*d %*d %" PRIu64,
                     read_sectors, write_sectors);
     if (nitems == 2) {
       success = true;
diff --git a/metrics/metrics_daemon_test.cc b/metrics/metrics_daemon_test.cc
index 0116a19..9b60ca4 100644
--- a/metrics/metrics_daemon_test.cc
+++ b/metrics/metrics_daemon_test.cc
@@ -36,8 +36,8 @@
 
 static const char kFakeDiskStatsName[] = "fake-disk-stats";
 static const char kFakeDiskStatsFormat[] =
-    "    1793     1788    %" PRIu64 "d   105580    "
-    "    196      175     %" PRIu64 "d    30290    "
+    "    1793     1788    %" PRIu64 "   105580    "
+    "    196      175     %" PRIu64 "    30290    "
     "    0    44060   135850\n";
 static const uint64_t kFakeReadSectors[] = {80000, 100000};
 static const uint64_t kFakeWriteSectors[] = {3000, 4000};