diff --git a/src/io/cmsg.rs b/src/io/cmsg.rs
index 28acca6..293b69d 100644
--- a/src/io/cmsg.rs
+++ b/src/io/cmsg.rs
@@ -14,11 +14,10 @@ pub const fn capacity<T: Sized>() -> usize {
 
 pub fn buffer<T: Sized>() -> Vec<u8> {
     let capacity = capacity::<T>();
-    let mut buf = Vec::with_capacity(capacity);
     unsafe {
-        buf.set_len(capacity);
+        let data = std::alloc::alloc(std::alloc::Layout::array::<u8>(capacity).unwrap());
+        Vec::from_raw_parts(data as *mut u8, capacity, capacity)
     }
-    buf
 }
 
 pub struct RawCmsgIterator<'a> {
diff --git a/src/tools.rs b/src/tools.rs
index 01a32b5..44cd943 100644
--- a/src/tools.rs
+++ b/src/tools.rs
@@ -54,9 +54,8 @@ pub mod vec {
     /// This is generally safe to call, but the contents of the vector are undefined.
     #[inline]
     pub unsafe fn uninitialized(len: usize) -> Vec<u8> {
-        let mut out = Vec::with_capacity(len);
-        out.set_len(len);
-        out
+        let data = std::alloc::alloc(std::alloc::Layout::array::<u8>(len).unwrap());
+        Vec::from_raw_parts(data as *mut u8, len, len)
     }
 }