1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index da1b7a7bdde..3a41b74fb79 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -3048,7 +3048,7 @@ mod test {
     #[test]
     fn test_signed_int_to_string() {
         let pos_int = ast::LitInt(42, ast::SignedIntLit(ast::TyI32, ast::Plus));
-        let neg_int = ast::LitInt((-42) as u64, ast::SignedIntLit(ast::TyI32, ast::Minus));
+        let neg_int = ast::LitInt((!42 + 1) as u64, ast::SignedIntLit(ast::TyI32, ast::Minus));
         assert_eq!(format!("-{}", lit_to_string(&codemap::dummy_spanned(pos_int))),
                    lit_to_string(&codemap::dummy_spanned(neg_int)));
     }