diff --git a/.gitignore b/.gitignore
index 623ee40..e158932 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ target
 *.ijvm
 *.conf
 goJASM
+rustijvm
diff --git a/Cargo.lock b/Cargo.lock
index 005e0c7..915d492 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,4 +1,4 @@
-[root]
+[[package]]
 name = "rustijvm"
 version = "0.1.0"
 
diff --git a/src/ijvm/ops.rs b/src/ijvm/ops.rs
index c052d1d..ce3e9bd 100644
--- a/src/ijvm/ops.rs
+++ b/src/ijvm/ops.rs
@@ -216,7 +216,7 @@ fn invokevirtual(machine: &mut Machine) -> Result<()> {
 
     // Lifetime for cur_stack
     {
-        let mut cur_stack = machine.cur_stack();
+        let cur_stack = machine.cur_stack();
         for i in 1..arg_count {
             newframe.set((arg_count - i) as usize, cur_stack.pop()?)?;
         }