diff --git a/src/parser.c b/src/parser.c
index 5f9f652..92afb0a 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -199,11 +199,13 @@ void calculateAddressFormat(a64inst_instruction *instr,  char *tokens[], int tok
         instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_PRE_INDEXED;
         instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.indexedOffset = getOperandNumber(operands[1]);
 
-    } else if( (isOperandRegister(*operands[0]) == 1)
-                && (isOperandRegister(*operands[1]) == 1)){
-                    //register
-                    instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_REGISTER_OFFSET;
-                    instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.offsetReg = getOperandNumber(operands[1]);
+    } else if(operandCount==2) {
+        if((isOperandRegister(*operands[0]) == 1)
+            && (isOperandRegister(*operands[1]) == 1)){
+                //register
+                instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_REGISTER_OFFSET;
+                instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.offsetReg = getOperandNumber(operands[1]);
+        }
     } else if(unsplitString[strlen(unsplitString)-1] == ']') {
         // POST_INDEXED
         instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_POST_INDEXED;