diff --git a/src/type_of.rs b/src/type_of.rs
index d85ed4f12ffa..b7b1be5369c4 100644
--- a/src/type_of.rs
+++ b/src/type_of.rs
@@ -213,9 +213,8 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
                 // NOTE: we cannot remove this match like in the LLVM codegen because the call
                 // to fn_ptr_backend_type handle the on-stack attribute.
                 // TODO(antoyo): find a less hackish way to hande the on-stack attribute.
-                ty::FnPtr(sig) => {
-                    cx.fn_ptr_backend_type(cx.fn_abi_of_fn_ptr(sig, ty::List::empty()))
-                }
+                ty::FnPtr(sig_tys, hdr) => cx
+                    .fn_ptr_backend_type(cx.fn_abi_of_fn_ptr(sig_tys.with(hdr), ty::List::empty())),
                 _ => self.scalar_gcc_type_at(cx, scalar, Size::ZERO),
             };
             cx.scalar_types.borrow_mut().insert(self.ty, ty);