diff --git a/assembler/assembler.go b/assembler/assembler.go
index 3fc0b06..fa16132 100644
--- a/assembler/assembler.go
+++ b/assembler/assembler.go
@@ -89,7 +89,7 @@ func assembleInstruction(in instruction) (*vm.Instruction, error) {
 	}
 
 	if len(operands) >= 2 {
-		op2, err := assembleOperand(operands[0])
+		op2, err := assembleOperand(operands[1])
 		if err != nil {
 			return nil, errors.Wrapf(err, "In second operand")
 		}