diff --git a/vncviewer/UserDialog.cxx b/vncviewer/UserDialog.cxx
index 901503c6dd..13821a9c54 100644
--- a/vncviewer/UserDialog.cxx
+++ b/vncviewer/UserDialog.cxx
@@ -109,7 +109,7 @@ void UserDialog::getUserPasswd(bool secure_, std::string* user,
   }
 
   if (!user && passwordFileName[0]) {
-    std::vector<uint8_t> obfPwd(256);
+    std::vector<uint8_t> obfPwd(8);
     FILE* fp;
 
     fp = fopen(passwordFileName, "rb");