diff --git a/Utils.h b/Utils.h
index 48a57d9..c083021 100644
--- a/Utils.h
+++ b/Utils.h
@@ -134,6 +134,7 @@
 
 bool FsyncDirectory(const std::string& dirname);
 
+bool writeStringToFile(const std::string& payload, const std::string& filename);
 }  // namespace vold
 }  // namespace android