diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index 57f4550..57fd15e 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -23,7 +23,7 @@ impl Machine {
 		value = (value << 32) + value;
 		for item in &mut shiftmask {
 			*item = value;
-			value = value >> 1;
+			value >>= 1;
 		}
 
 		Machine {
@@ -202,8 +202,7 @@ impl Machine {
 						machine.int_reg[inst.rd as usize] = machine.int_reg[inst.rs1 as usize] + inst.imm12_I_signed as i64;
 					},
 					RISCV_OPI_SLTI => {
-						machine.int_reg[inst.rd as usize] = 
-							if machine.int_reg[inst.rs1 as usize] < inst.imm12_I_signed as i64 { 1 } else { 0 };
+						machine.int_reg[inst.rd as usize] = (machine.int_reg[inst.rs1 as usize] < inst.imm12_I_signed as i64) as i64;
 					},
 					RISCV_OPI_XORI => {
 						machine.int_reg[inst.rd as usize] = machine.int_reg[inst.rs1 as usize] ^ inst.imm12_I_signed as i64;
@@ -378,6 +377,5 @@ impl Machine {
 
 #[cfg(test)]
  mod test {
- 	use super::Machine;
  
  }