diff --git a/src/gbemu/cpu.c b/src/gbemu/cpu.c
index 0ee60a3..b49831b 100644
--- a/src/gbemu/cpu.c
+++ b/src/gbemu/cpu.c
@@ -156,6 +156,7 @@ static const unsigned int cb_op_cycles[256] = { 0 };
 	do {								\
 		(cpu)->nf = 0;						\
 		(cpu)->hf = CALC_H_ADD((src), (dst));			\
+		(cpu)->cf = CALC_C_ADD_8((src), (dst));			\
 		(dst) += (src);						\
 		(cpu)->zf = (dst) == 0;					\
 	} while (0)