diff --git a/src/deflate/context.rs b/src/deflate/context.rs
index 2fa2e23..65e5322 100644
--- a/src/deflate/context.rs
+++ b/src/deflate/context.rs
@@ -67,7 +67,10 @@ impl Compressor {
         debug_assert!(window_bits <= 15, "Received too large window size.");
 
         unsafe {
-            let mut stream: Box<ffi::z_stream> = Box::new(mem::zeroed());
+            let mut stream: Box<ffi::z_stream> = Box::new({
+                let maybe = mem::MaybeUninit::<ffi::z_stream>::zeroed();
+                maybe.assume_init()
+            });
             let result = ffi::deflateInit2_(
                 stream.as_mut(),
                 9,
@@ -139,7 +142,10 @@ impl Decompressor {
         debug_assert!(window_bits <= 15, "Received too large window size.");
 
         unsafe {
-            let mut stream: Box<ffi::z_stream> = Box::new(mem::zeroed());
+            let mut stream: Box<ffi::z_stream> = Box::new({
+                let maybe = mem::MaybeUninit::<ffi::z_stream>::zeroed();
+                maybe.assume_init()
+            });
             let result = ffi::inflateInit2_(
                 stream.as_mut(),
                 -window_bits as c_int,