diff --git a/libs/binder/PermissionCache.cpp b/libs/binder/PermissionCache.cpp
index a503be8..a4c28ad 100644
--- a/libs/binder/PermissionCache.cpp
+++ b/libs/binder/PermissionCache.cpp
@@ -75,7 +75,7 @@
 }
 
 bool PermissionCache::checkCallingPermission(const String16& permission) {
-    return PermissionCache::checkCallingPermission(permission, NULL, NULL);
+    return PermissionCache::checkCallingPermission(permission, nullptr, nullptr);
 }
 
 bool PermissionCache::checkCallingPermission(