diff --git a/libs/binder/PermissionController.cpp b/libs/binder/PermissionController.cpp
index 96df33c..34b2ca5 100644
--- a/libs/binder/PermissionController.cpp
+++ b/libs/binder/PermissionController.cpp
@@ -41,7 +41,7 @@
                 ALOGI("Waiting for permission service");
             } else if ((uptimeMillis() - startTime) > 10000) {
                 ALOGW("Waiting too long for permission service, giving up");
-                service = NULL;
+                service = nullptr;
                 break;
             }
             sleep(1);
@@ -56,13 +56,13 @@
 bool PermissionController::checkPermission(const String16& permission, int32_t pid, int32_t uid)
 {
     sp<IPermissionController> service = getService();
-    return service != NULL ? service->checkPermission(permission, pid, uid) : false;
+    return service != nullptr ? service->checkPermission(permission, pid, uid) : false;
 }
 
 int32_t PermissionController::noteOp(const String16& op, int32_t uid, const String16& packageName)
 {
     sp<IPermissionController> service = getService();
-    return service != NULL ? service->noteOp(op, uid, packageName) : MODE_ERRORED;
+    return service != nullptr ? service->noteOp(op, uid, packageName) : MODE_ERRORED;
 }
 
 void PermissionController::getPackagesForUid(const uid_t uid, Vector<String16> &packages)