diff --git a/tests/compiletests/src/main.rs b/tests/compiletests/src/main.rs
index c1cdb206..927a8c06 100644
--- a/tests/compiletests/src/main.rs
+++ b/tests/compiletests/src/main.rs
@@ -122,6 +122,7 @@ impl Runner {
                 "-Zunstable-options",
                 "-Zcrate-attr=no_std",
                 "-Zcrate-attr=feature(abi_ptx)",
+                "-Zui-testing",
             ]
             .join(" ")
         }
diff --git a/tests/compiletests/ui/lang/compile_fail.stderr b/tests/compiletests/ui/lang/compile_fail.stderr
index 16555a74..3d4332bb 100644
--- a/tests/compiletests/ui/lang/compile_fail.stderr
+++ b/tests/compiletests/ui/lang/compile_fail.stderr
@@ -1,10 +1,10 @@
 error[E0433]: failed to resolve: use of unresolved module or unlinked crate `std`
- --> $DIR/compile_fail.rs:5:14
-  |
-5 |     let _s = std::fs::File::create("foo.txt");
-  |              ^^^ use of unresolved module or unlinked crate `std`
-  |
-  = help: you might be missing a crate named `std`
+  --> $DIR/compile_fail.rs:5:14
+   |
+LL |     let _s = std::fs::File::create("foo.txt");
+   |              ^^^ use of unresolved module or unlinked crate `std`
+   |
+   = help: you might be missing a crate named `std`
 
 error: aborting due to 1 previous error