diff --git a/src/lib.rs b/src/lib.rs
index d44d364..cd4d6df 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,6 +30,6 @@ pub use self::c_types::{CChar, CUChar};
 pub use self::c_types::{CShort, CUShort, CInt, CUInt, CLong, CULong};
 pub use self::c_types::{CLongLong, CULongLong, CFloat, CDouble};
 pub use self::c_types::{CVoid, CReturnVoid};
-#[cfg(feature = "client")]
+#[cfg(feature="use_std")]
 pub use self::c_types::{CStr, CString, NullByteError};
 pub use self::raw::{AsRaw, AsRawMut, AsRawPtr, AsRawMutPtr, FromRaw, IntoRaw};