diff --git a/duel_build.py b/duel_build.py
index 5303085..5cc43ba 100644
--- a/duel_build.py
+++ b/duel_build.py
@@ -85,7 +85,7 @@
 typedef uint32 (*card_reader)(uint32, struct card_data*);
 void set_card_reader(card_reader f);
 typedef byte* (*script_reader)(const char*, int*);
-typedef uint32 (*message_handler)(void*, uint32);
+typedef uint32 (*message_handler)(intptr_t, uint32);
 extern "Python" uint32 message_handler_callback (void *, int32);
 void set_message_handler(message_handler f);
 extern "Python" byte *script_reader_callback(const char *, int *);
@@ -95,7 +95,7 @@
 void end_duel(ptr pduel);
 void get_log_message(ptr pduel, byte* buf);
 int32 get_message(ptr pduel, byte* buf);
-int32 process(ptr pduel);
+uint32 process(ptr pduel);
 void new_card(ptr pduel, uint32 code, uint8 owner, uint8 playerid, uint8 location, uint8 sequence, uint8 position);
 void new_tag_card(ptr pduel, uint32 code, uint8 owner, uint8 location);
 void set_player_info(ptr pduel, int32 playerid, int32 lp, int32 startcount, int32 drawcount);
diff --git a/ygo/utils.py b/ygo/utils.py
index dc3b279..60bbd98 100644
--- a/ygo/utils.py
+++ b/ygo/utils.py
@@ -13,6 +13,9 @@
 except ImportError:
 	DUEL_AVAILABLE = False
 
+PROCESSOR_FLAG = 0xf0000000
+PROCESSOR_END = 0x20000000
+
 def parse_lflist(filename):
 
 	lst = {}
@@ -36,9 +39,10 @@ def parse_lflist(filename):
 def process_duel(d):
 	while d.started:
 		res = d.process()
-		if res & 0x20000:
+		flag = res & PROCESSOR_FLAG
+		if flag & PROCESSOR_END:
 			break
-		elif res & 0x10000 and res != 0x10000:
+		elif flag == 0x10000000:
 			if d.keep_processing:
 				d.keep_processing = False
 				continue