diff --git a/library/compiler-builtins/Cargo.toml b/library/compiler-builtins/Cargo.toml
index d7419902d7aa..84cefb2d280f 100644
--- a/library/compiler-builtins/Cargo.toml
+++ b/library/compiler-builtins/Cargo.toml
@@ -17,7 +17,6 @@ c = ["gcc"]
 compiler-builtins = []
 default = ["compiler-builtins"]
 mem = []
-rustbuild = ["compiler-builtins"]
 mangled-names = []
 
 # generate tests