diff --git a/src/cpu/run/arithutil.rs b/src/cpu/run/arithutil.rs
index fc3a63d..f7943a7 100644
--- a/src/cpu/run/arithutil.rs
+++ b/src/cpu/run/arithutil.rs
@@ -28,15 +28,16 @@ impl CarryingAdd<u8, u16> for u16 {
 // NOTE: These generics are not as generic as they could be. The Into<u16> is just a shortcut because we
 //       only use up to u16s
 fn did_8bit_half_carry<L: Into<u16>, R: Into<u16>>(lhs: L, rhs: R) -> bool {
-    // https://robdor.com/2016/08/10/gameboy-emulator-half-carry-flag/
-    ((lhs.into() & 0xf) + (rhs.into() & 0xf)) & 0x10 == 0x10
+    // https://stackoverflow.com/a/7261149/1103734
+    (lhs.into() & 0xf) + (rhs.into() & 0xf) > 0xf
 }
 
 /// `did_8_bit_full_carry` checks whether or not the given addition would have done an 8 bit carry.
 // NOTE: These generics are not as generic as they could be. The Into<u16> is just a shortcut because we
 //       only use up to u16s
 fn did_8bit_full_carry<L: Into<u16>, R: Into<u16>>(lhs: L, rhs: R) -> bool {
-    (((lhs.into() & 0xff) + (rhs.into() & 0xff)) & 0x100) == 0x100
+    // https://stackoverflow.com/a/7261149/1103734
+    ((lhs.into() & 0xff) + (rhs.into() & 0xff)) > 0xff
 }
 
 #[cfg(test)]