diff --git a/KeyStorage.cpp b/KeyStorage.cpp
index 9dd4991..fc700c5 100644
--- a/KeyStorage.cpp
+++ b/KeyStorage.cpp
@@ -484,6 +484,7 @@
         if (!encryptWithoutKeymaster(appId, key, &encryptedKey)) return false;
     }
     if (!writeStringToFile(encryptedKey, dir + "/" + kFn_encrypted_key)) return false;
+    if (!FsyncDirectory(dir)) return false;
     return true;
 }