diff --git a/library/compiler-builtins/src/bin/intrinsics.rs b/library/compiler-builtins/src/bin/intrinsics.rs
index b0de331afd4c..e0b619f55989 100644
--- a/library/compiler-builtins/src/bin/intrinsics.rs
+++ b/library/compiler-builtins/src/bin/intrinsics.rs
@@ -400,9 +400,10 @@ pub fn _Unwind_Resume() {}
 // Lang items
 #[cfg(not(test))]
 #[lang = "eh_personality"]
+#[no_mangle]
 extern "C" fn eh_personality() {}
 
 #[cfg(not(test))]
-#[no_mangle]
 #[lang = "panic_fmt"]
+#[no_mangle]
 extern "C" fn panic_fmt() {}