diff --git a/src/execute.c b/src/execute.c
index cc5d0ba..fc436af 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -262,7 +262,7 @@ static void executeDPRegister(Machine *state, a64inst_instruction *inst) {
                             writeRegister(state, dest, regType, result);
                             
                             updateCondNZ(state, result, regType);
-                            state->conditionCodes.Overflow = src1Val < result;
+                            state->conditionCodes.Overflow = getMSB(src1Val, regType) != getMSB(src2Val, regType) && getMSB(src1Val, regType) != getMSB(result, regType);
                             state->conditionCodes.Carry = src1Val >= src2Val;
                             break;