diff --git a/include/cpu.h b/include/cpu.h
index 4b55a912..5dbfe745 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -68,6 +68,7 @@ enum {
 	t_LASTFLAG
 };
 
+extern bool parity_lookup[256];
 
 void CPU_LLDT(Bitu selector);
 void CPU_LTR(Bitu selector);