diff --git a/cpu/decoder.cpp b/cpu/decoder.cpp
index 0a599e0..fa318f4 100644
--- a/cpu/decoder.cpp
+++ b/cpu/decoder.cpp
@@ -263,6 +263,7 @@ void Cpu::executeInstruction()
               break;
             case 0x30: // SWAP
               data = ((data >> 4) & 0x0F) | ((data << 4) & 0xF0);
+              state.carry = false;
               break;
             case 0x38: // SRL
               state.carry = (data & 0x01);