diff --git a/compiler/rustc_lint/src/dangling.rs b/compiler/rustc_lint/src/dangling.rs
index 21966758b1061..574785bc39590 100644
--- a/compiler/rustc_lint/src/dangling.rs
+++ b/compiler/rustc_lint/src/dangling.rs
@@ -200,8 +200,8 @@ fn is_temporary_rvalue(expr: &Expr<'_>) -> bool {
     }
 }
 
-// Array, Vec, String, CString, MaybeUninit, Cell, Box<[_]>, Box<str>, Box<CStr>,
-// or any of the above in arbitrary many nested Box'es.
+// Array, Vec, String, CString, MaybeUninit, Cell, Box<[_]>, Box<str>, Box<CStr>, UnsafeCell,
+// SyncUnsafeCell, or any of the above in arbitrary many nested Box'es.
 fn owns_allocation(tcx: TyCtxt<'_>, ty: Ty<'_>) -> bool {
     if ty.is_array() {
         true
@@ -217,7 +217,7 @@ fn owns_allocation(tcx: TyCtxt<'_>, ty: Ty<'_>) -> bool {
             }
         }
         tcx.get_diagnostic_name(def.did()).is_some_and(|name| {
-            matches!(name, sym::cstring_type | sym::Vec | sym::Cell | sym::sync_unsafe_cell)
+            matches!(name, sym::cstring_type | sym::Vec | sym::Cell | sym::SyncUnsafeCell)
         })
     } else {
         false
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index dd969831253f5..a7c43a2084028 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -316,6 +316,7 @@ symbols! {
         SubdiagMessage,
         Subdiagnostic,
         Sync,
+        SyncUnsafeCell,
         T,
         Target,
         ToOwned,
@@ -1929,7 +1930,6 @@ symbols! {
         surface_async_drop_in_place,
         sym,
         sync,
-        sync_unsafe_cell,
         synthetic,
         t32,
         target,
diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs
index e595ea56392b4..20904c9bc7612 100644
--- a/library/core/src/cell.rs
+++ b/library/core/src/cell.rs
@@ -2273,7 +2273,7 @@ impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<UnsafeCell<U>> for UnsafeCell<T>
 /// See [`UnsafeCell`] for details.
 #[unstable(feature = "sync_unsafe_cell", issue = "95439")]
 #[repr(transparent)]
-#[rustc_diagnostic_item = "sync_unsafe_cell"]
+#[rustc_diagnostic_item = "SyncUnsafeCell"]
 #[rustc_pub_transparent]
 pub struct SyncUnsafeCell<T: ?Sized> {
     value: UnsafeCell<T>,