diff --git a/crates/napi/src/bindgen_runtime/js_values/arraybuffer.rs b/crates/napi/src/bindgen_runtime/js_values/arraybuffer.rs
index c7363b4c..086e585b 100644
--- a/crates/napi/src/bindgen_runtime/js_values/arraybuffer.rs
+++ b/crates/napi/src/bindgen_runtime/js_values/arraybuffer.rs
@@ -125,6 +125,7 @@ macro_rules! impl_typed_array {
       fn noop_finalize(_data: *mut $rust_type, _length: usize) {}
 
       pub fn new(mut data: Vec<$rust_type>) -> Self {
+        data.shrink_to_fit();
         let ret = $name {
           data: data.as_mut_ptr(),
           length: data.len(),
diff --git a/memory-testing/buffer.mjs b/memory-testing/buffer.mjs
index 24f257f8..a2c37688 100644
--- a/memory-testing/buffer.mjs
+++ b/memory-testing/buffer.mjs
@@ -17,6 +17,7 @@ while (true) {
   api.arrayBufferLen()
   api.bufferConvert(Buffer.from(FIXTURE))
   api.arrayBufferConvert(Uint8Array.from(FIXTURE))
+  api.arrayBufferCreateFromVecWithSpareCapacity()
   api.bufferPassThrough(Buffer.from(FIXTURE))
   api.arrayBufferPassThrough(Uint8Array.from(FIXTURE))
   if (i % 10 === 0) {
diff --git a/memory-testing/src/lib.rs b/memory-testing/src/lib.rs
index 85c87ef2..ce61119a 100644
--- a/memory-testing/src/lib.rs
+++ b/memory-testing/src/lib.rs
@@ -157,6 +157,13 @@ pub fn array_buffer_convert(array_buffer: Uint8Array) -> Uint8Array {
   Uint8Array::new(vec![1; array_buffer.len()])
 }
 
+#[napi]
+pub fn array_buffer_create_from_vec_with_spare_capacity() -> Uint8Array {
+  let mut v = vec![1; 1024 * 10240];
+  v.truncate(1);
+  Uint8Array::new(v)
+}
+
 #[napi]
 pub fn array_buffer_len() -> u32 {
   Uint8Array::new(vec![1; 1024 * 10240]).len() as u32