diff --git a/tests/assembly/wasm_exceptions.rs b/tests/assembly/wasm_exceptions.rs
index 7bdf7f1287c..f05ccfadc58 100644
--- a/tests/assembly/wasm_exceptions.rs
+++ b/tests/assembly/wasm_exceptions.rs
@@ -6,12 +6,12 @@
 
 #![crate_type = "lib"]
 #![feature(core_intrinsics)]
-#![feature(rustc_attrs)]
+
+extern "C-unwind" {
+    fn may_panic();
+}
 
 extern "C" {
-    fn may_panic();
-
-    #[rustc_nounwind]
     fn log_number(number: usize);
 }
 
diff --git a/tests/codegen/wasm_exceptions.rs b/tests/codegen/wasm_exceptions.rs
index 3910850e03a..719499dd8ea 100644
--- a/tests/codegen/wasm_exceptions.rs
+++ b/tests/codegen/wasm_exceptions.rs
@@ -3,12 +3,12 @@
 
 #![crate_type = "lib"]
 #![feature(core_intrinsics)]
-#![feature(rustc_attrs)]
+
+extern "C-unwind" {
+    fn may_panic();
+}
 
 extern "C" {
-    fn may_panic();
-
-    #[rustc_nounwind]
     fn log_number(number: usize);
 }