diff --git a/src/execute.c b/src/execute.c
index 86aa33c..9c8734b 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -391,11 +391,11 @@ void execute_SDT(Machine *state, a64inst_instruction *inst) {
             state->registers[inst->data.SingleTransferData.target] = readDoubleWord(state->memory, address);
         }
     } else {
-        if (inst->data.SingleTransferData.regType == a64inst_W) {
-            // 32 bit access
-            state->registers[inst->data.SingleTransferData.target] = readWord(state->memory, address);
-        } else {
-            state->registers[inst->data.SingleTransferData.target] = readDoubleWord(state->memory, address);
+        *(word *)(state->memory + address) = state->registers[inst->data.SingleTransferData.target];
+
+         // Update base register if post indexed
+        if (inst->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode == a64inst_POST_INDEXED) {
+            writeRegister(state, inst->data.SingleTransferData.processOpData.singleDataTransferData.base, inst->data.SingleTransferData.regType == a64inst_W,  address + inst->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.indexedOffset);
         }
     }