diff --git a/adb/daemon/main.cpp b/adb/daemon/main.cpp
index b0a0162..b54243e 100644
--- a/adb/daemon/main.cpp
+++ b/adb/daemon/main.cpp
@@ -28,8 +28,10 @@
 #include <memory>
 
 #include <android-base/logging.h>
+#include <android-base/macros.h>
 #include <android-base/stringprintf.h>
 #include <libminijail.h>
+#include <scoped_minijail.h>
 
 #include "cutils/properties.h"
 #include "debuggerd/client.h"
@@ -99,8 +101,7 @@
 }
 
 static void drop_privileges(int server_port) {
-    std::unique_ptr<minijail, void (*)(minijail*)> jail(minijail_new(),
-                                                        &minijail_destroy);
+    ScopedMinijail jail(minijail_new());
 
     // Add extra groups:
     // AID_ADB to access the USB driver
@@ -116,9 +117,7 @@
                       AID_INET,     AID_NET_BT,    AID_NET_BT_ADMIN,
                       AID_SDCARD_R, AID_SDCARD_RW, AID_NET_BW_STATS,
                       AID_READPROC};
-    minijail_set_supplementary_gids(jail.get(),
-                                    sizeof(groups) / sizeof(groups[0]),
-                                    groups);
+    minijail_set_supplementary_gids(jail.get(), arraysize(groups), groups);
 
     // Don't listen on a port (default 5037) if running in secure mode.
     // Don't run as root if running in secure mode.
diff --git a/sdcard/sdcard.cpp b/sdcard/sdcard.cpp
index e82f29e..ba63636 100644
--- a/sdcard/sdcard.cpp
+++ b/sdcard/sdcard.cpp
@@ -29,6 +29,7 @@
 #include <unistd.h>
 
 #include <android-base/logging.h>
+#include <android-base/macros.h>
 
 #include <cutils/fs.h>
 #include <cutils/hashmap.h>
@@ -209,7 +210,7 @@
 
 static void drop_privs(uid_t uid, gid_t gid) {
     ScopedMinijail j(minijail_new());
-    minijail_set_supplementary_gids(j.get(), sizeof(kGroups) / sizeof(kGroups[0]), kGroups);
+    minijail_set_supplementary_gids(j.get(), arraysize(kGroups), kGroups);
     minijail_change_gid(j.get(), gid);
     minijail_change_uid(j.get(), uid);
     /* minijail_enter() will abort if priv-dropping fails. */