diff --git a/src/Quest.cc b/src/Quest.cc
index 05770ae1..3e623ba4 100644
--- a/src/Quest.cc
+++ b/src/Quest.cc
@@ -692,12 +692,14 @@ static string create_download_quest_file(const string& compressed_data,
   data += compressed_data;
 
   // Add temporary extra bytes if necessary so encryption won't fail - the data
-  // size must be a multiple of 4 for PSO V2 encryption.
+  // size must be a multiple of 4 for PSO PC encryption.
+  size_t original_size = data.size();
   data.resize((data.size() + 3) & (~3));
 
-  PSOV3Encryption encr(encryption_seed);
+  PSOV2Encryption encr(encryption_seed);
   encr.encrypt(data.data() + sizeof(PSODownloadQuestHeader),
       data.size() - sizeof(PSODownloadQuestHeader));
+  data.resize(original_size);
 
   return data;
 }