1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_const_eval/src/interpret/traits.rs b/compiler/rustc_const_eval/src/interpret/traits.rs
index cab23b724..fa15d466a 100644
--- a/compiler/rustc_const_eval/src/interpret/traits.rs
+++ b/compiler/rustc_const_eval/src/interpret/traits.rs
@@ -53,7 +53,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     ) -> InterpResult<'tcx, (Size, Align)> {
         let (ty, _trait_ref) = self.get_ptr_vtable(vtable)?;
         let layout = self.layout_of(ty)?;
-        assert!(!layout.is_unsized(), "there are no vtables for unsized types");
+        assert!(layout.is_sized(), "there are no vtables for unsized types");
         Ok((layout.size, layout.align.abi))
     }
 }