silly mistake that i have literally made before

src/processor/memory.rs

@@ -1,6 +1,10 @@
 use self::mmio::{Apu, Gpu, Joypad, Serial};
 pub use self::rom::Rom;
-use crate::{processor::SplitRegister, util::set_bit, verbose_println, Cpu};
+use crate::{
+    processor::SplitRegister,
+    util::{clear_bit, set_bit},
+    verbose_println, Cpu,
+};
 use gilrs::Gilrs;
 use minifb::{Key, Window};
 
@@ -241,6 +245,9 @@ impl Cpu {
 
         if gpu_interrupts.lcd_stat {
             self.memory.set(0xFF0F, set_bit(self.memory.get(0xFF0F), 1));
+        } else {
+            self.memory
+                .set(0xFF0F, clear_bit(self.memory.get(0xFF0F), 1));
         }
     }
 }