diff --git a/src/boxed.rs b/src/boxed.rs
index b1878bac..df403b58 100644
--- a/src/boxed.rs
+++ b/src/boxed.rs
@@ -366,10 +366,10 @@ impl<T: 'static, MM: BoxedMemoryManager<T>> Uninitialized for Boxed<T, MM> {
     unsafe fn uninitialized() -> Self {
         Boxed {
             inner: {
-                let mut inner = Box::<T>::new(mem::zeroed());
-                MM::init(&mut *inner);
+                let mut inner = mem::MaybeUninit::zeroed();
+                MM::init(inner.as_mut_ptr());
 
-                AnyBox::Native(inner)
+                AnyBox::Native(Box::new(inner.assume_init()))
             },
             _dummy: PhantomData,
         }
diff --git a/src/object.rs b/src/object.rs
index a985bb76..0fa4762f 100644
--- a/src/object.rs
+++ b/src/object.rs
@@ -1269,8 +1269,9 @@ impl<T: ObjectType> ObjectExt for T {
             return Err(glib_bool_error!("Signal not found"));
         }
 
-        let mut details = mem::zeroed();
-        gobject_sys::g_signal_query(signal_id, &mut details);
+        let mut details = mem::MaybeUninit::zeroed();
+        gobject_sys::g_signal_query(signal_id, details.as_mut_ptr());
+        let details = details.assume_init();
         if details.signal_id != signal_id {
             return Err(glib_bool_error!("Signal not found"));
         }
@@ -1370,8 +1371,9 @@ impl<T: ObjectType> ObjectExt for T {
                 return Err(glib_bool_error!("Signal not found"));
             }
 
-            let mut details = mem::zeroed();
-            gobject_sys::g_signal_query(signal_id, &mut details);
+            let mut details = mem::MaybeUninit::zeroed();
+            gobject_sys::g_signal_query(signal_id, details.as_mut_ptr());
+            let details = details.assume_init();
             if details.signal_id != signal_id {
                 return Err(glib_bool_error!("Signal not found"));
             }
diff --git a/src/value.rs b/src/value.rs
index 53f7953a..e552726f 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -199,7 +199,7 @@ impl Value {
     }
 
     #[doc(hidden)]
-    pub fn into_raw(mut self) -> gobject_sys::GValue {
+    pub fn into_raw(self) -> gobject_sys::GValue {
         unsafe {
             let ret = ptr::read(&self.0);
             mem::forget(self);
@@ -273,7 +273,7 @@ impl From<SendValue> for Value {
 
 impl Uninitialized for Value {
     unsafe fn uninitialized() -> Value {
-        Value(mem::zeroed(), PhantomData)
+        mem::zeroed()
     }
 }