diff --git a/src/rustc/compiler_builtins_shim/Cargo.toml b/src/rustc/compiler_builtins_shim/Cargo.toml
index 792f7089754daf89b7954fc8617e7a25dc1d072f..9804177280f66b147a26773402ab102127a34915 100644
--- a/src/rustc/compiler_builtins_shim/Cargo.toml
+++ b/src/rustc/compiler_builtins_shim/Cargo.toml
@@ -34,8 +34,7 @@ cc = "1.0.1"
 
 [features]
 c = []
-default = ["c", "rustbuild", "compiler-builtins", "mangled-names"]
+default = ["rustbuild", "compiler-builtins"]
 mem = []
 rustbuild = []
 compiler-builtins = []
-mangled-names = []