diff --git a/rust-version b/rust-version
index 45abe7e8c65..86a09bfa57b 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-0ed9c64c3e63acac9bd77abce62501696c390450
+6077b7cda466afa2b75a62b232ab46dbeb148bcb
diff --git a/src/helpers.rs b/src/helpers.rs
index 29bf92af3fa..d0b0852d010 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -259,7 +259,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         let mir = this.load_mir(f.def, None)?;
         let dest = match dest {
             Some(dest) => *dest,
-            None => MPlaceTy::dangling(this.layout_of(mir.return_ty())?).into(),
+            None => MPlaceTy::fake_alloc_zst(this.layout_of(mir.return_ty())?).into(),
         };
         this.push_stack_frame(f, mir, &dest, stack_pop)?;