diff --git a/examples/heap.rs b/examples/heap.rs
index b6723bd..24b2025 100644
--- a/examples/heap.rs
+++ b/examples/heap.rs
@@ -12,7 +12,7 @@ pub fn new_value(i: usize) -> Vec<u8> {
 fn main() {
   const N: usize = 1000;
   let l = SkipMap::with_options(Options::new().with_capacity(1 << 20)).unwrap();
-  let wg = Arc::new(());
+  let mut wg = Arc::new(());
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();
@@ -21,7 +21,7 @@ fn main() {
       drop(w);
     });
   }
-  while Arc::strong_count(&wg) > 1 {}
+  while Arc::get_mut(&mut wg).is_none() {}
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();
diff --git a/examples/mmap.rs b/examples/mmap.rs
index 1c8222f..8e8dcff 100644
--- a/examples/mmap.rs
+++ b/examples/mmap.rs
@@ -18,7 +18,7 @@ fn main() {
     .write(true);
 
   let l = SkipMap::map_mut("test.wal", open_options, mmap_options).unwrap();
-  let wg = Arc::new(());
+  let mut wg = Arc::new(());
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();
@@ -27,7 +27,7 @@ fn main() {
       drop(w);
     });
   }
-  while Arc::strong_count(&wg) > 1 {}
+  while Arc::get_mut(&mut wg).is_none() {}
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();
diff --git a/examples/mmap_anon.rs b/examples/mmap_anon.rs
index 7370b65..c1c4391 100644
--- a/examples/mmap_anon.rs
+++ b/examples/mmap_anon.rs
@@ -14,7 +14,7 @@ fn main() {
 
   let mmap_options = skl::MmapOptions::default().len(1 << 20);
   let l = SkipMap::map_anon(mmap_options).unwrap();
-  let wg = Arc::new(());
+  let mut wg = Arc::new(());
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();
@@ -23,7 +23,7 @@ fn main() {
       drop(w);
     });
   }
-  while Arc::strong_count(&wg) > 1 {}
+  while Arc::get_mut(&mut wg).is_none() {}
   for i in 0..N {
     let w = wg.clone();
     let l = l.clone();