diff --git a/3rdParty/Storm/Source/storm.h b/3rdParty/Storm/Source/storm.h
index 4e1c032c6..278f2e9c0 100644
--- a/3rdParty/Storm/Source/storm.h
+++ b/3rdParty/Storm/Source/storm.h
@@ -393,6 +393,8 @@ SNetSendMessage(
 #define SNPLAYER_ALL    -1
 #define SNPLAYER_OTHERS -2
 
+#define MPQ_FLAG_READ_ONLY 1
+
 
 /*  SNetSendTurn @ 128
  *
diff --git a/Stub/init.cpp b/Stub/init.cpp
index a1eb0ec34..c9d7d8502 100644
--- a/Stub/init.cpp
+++ b/Stub/init.cpp
@@ -86,10 +86,10 @@ void __cdecl init_archives()
 {
 	DUMMY(); // We will need to remove the find_file_in_std_directories funct when it comes to mobile
 
-	SFileOpenArchive(find_file_in_std_directories("diabdat.mpq").c_str(), 1000, 0, &diabdat_mpq);
+	SFileOpenArchive(find_file_in_std_directories("diabdat.mpq").c_str(), 1000, MPQ_FLAG_READ_ONLY, &diabdat_mpq);
 	assert(diabdat_mpq);
 
-	SFileOpenArchive("patch_rt.mpq", 1000, 0, &patch_rt_mpq);
+	SFileOpenArchive("patch_rt.mpq", 1000, MPQ_FLAG_READ_ONLY, &patch_rt_mpq);
 }
 
 void GetAvailableHeroes()