diff --git a/src/lib/cpu.c b/src/lib/cpu.c
index 5761bca..24b800b 100644
--- a/src/lib/cpu.c
+++ b/src/lib/cpu.c
@@ -21,8 +21,6 @@ void cpu_reset(registers *reg)
   reg->halt = false;
   reg->stop = false;
 
-  reg->halt_mask = 0xFF;
-
   reg->timer.tick = 0;
   reg->timer.div = 0;
 }
@@ -55,12 +53,10 @@ static inline void check_halt_release(registers *reg, memory *mem)
 {
   uint8_t if_flags = mmu_read_byte(mem, MEM_IF_ADDR);
   if_flags &= mmu_read_byte(mem, MEM_IE_ADDR);
-  if_flags &= reg->halt_mask;
 
   if (if_flags)
     {
       reg->halt = false;
-      reg->halt_mask = 0xFF;
     }
 }
 
diff --git a/src/lib/cpu.h b/src/lib/cpu.h
index 0ea1f49..65c34a2 100644
--- a/src/lib/cpu.h
+++ b/src/lib/cpu.h
@@ -45,7 +45,6 @@ struct registers_s {
     uint16_t m, t;
   } clock;
   bool halt, stop;
-  uint8_t halt_mask;
   struct {
     unsigned int tick, div, t_timer;
   } timer;
diff --git a/src/lib/cpu_inline.h b/src/lib/cpu_inline.h
index 2bc22b5..acc721a 100644
--- a/src/lib/cpu_inline.h
+++ b/src/lib/cpu_inline.h
@@ -123,7 +123,6 @@ static inline void nop(registers *reg)
 static inline void halt(registers *reg, memory *mem)
 {
   reg->halt = true;
-  reg->halt_mask = ~mmu_read_byte(mem, MEM_IF_ADDR);
 
   reg->clock.last.t = 4;
 }