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diff --git a/cpu/cz80/cz80macro.h b/cpu/cz80/cz80macro.h
index 16f3a70..2e21d40 100644
--- a/cpu/cz80/cz80macro.h
+++ b/cpu/cz80/cz80macro.h
@@ -73,8 +73,8 @@
 #define WRITE_MEM8(A, D) { \
 	unsigned short a = A; \
 	unsigned char d = D; \
-	unsigned long v = z80_write_map[a >> Z80_MEM_SHIFT]; \
-	if (v & 0x80000000) \
+	uptr v = z80_write_map[a >> Z80_MEM_SHIFT]; \
+	if (map_flag_set(v)) \
 		((z80_write_f *)(v << 1))(a, d); \
 	else \
 		*(unsigned char *)((v << 1) + a) = d; \