diff --git a/src/opt/gvn.rs b/src/opt/gvn.rs
index f7a2485..765904c 100644
--- a/src/opt/gvn.rs
+++ b/src/opt/gvn.rs
@@ -1,11 +1,9 @@
 use core::ops::Deref;
 use std::collections::{HashMap, HashSet};
-use std::ops::DerefMut;
 
 use itertools::izip;
 use lang_c::ast;
 
-use crate::asm::Register;
 use crate::ir::*;
 use crate::opt::opt_utils::*;
 use crate::opt::*;