1 files changed, 1 insertions, 1 deletions
diff --git a/CPU.c b/CPU.c
index 4e7dfa1..b17b8db 100644
--- a/CPU.c
+++ b/CPU.c
@@ -168,7 +168,7 @@ void enable_flag(struct CPU *cpu, uint8_t flag){
 }
 
 void disable_flag(struct CPU *cpu, uint8_t flag){
-    cpu->status &= !flag;
+    cpu->status &= ~flag;
 }
 
 int test_flag(struct CPU *cpu, uint8_t flag){