1 files changed, 4 insertions, 2 deletions
diff --git a/components/style/gecko_string_cache/mod.rs b/components/style/gecko_string_cache/mod.rs
index b8f3ff7f048..b209f316d09 100644
--- a/components/style/gecko_string_cache/mod.rs
+++ b/components/style/gecko_string_cache/mod.rs
@@ -202,7 +202,8 @@ impl WeakAtom {
     where
         F: FnOnce(&str) -> Output,
     {
-        let mut buffer: [u8; 64] = unsafe { mem::uninitialized() };
+        let mut buffer = mem::MaybeUninit::<[u8; 64]>::uninit();
+        let buffer = unsafe { &mut *buffer.as_mut_ptr() };
 
         // The total string length in utf16 is going to be less than or equal
         // the slice length (each utf16 character is going to take at least one
@@ -271,7 +272,8 @@ impl WeakAtom {
         }
 
         let slice = self.as_slice();
-        let mut buffer: [u16; 64] = unsafe { mem::uninitialized() };
+        let mut buffer = mem::MaybeUninit::<[u16; 64]>::uninit();
+        let buffer = unsafe { &mut *buffer.as_mut_ptr() };
         let mut vec;
         let mutable_slice = if let Some(buffer_prefix) = buffer.get_mut(..slice.len()) {
             buffer_prefix.copy_from_slice(slice);