diff --git a/enum_index/Cargo.toml b/enum_index/Cargo.toml
index 384bcfd..0c7b437 100644
--- a/enum_index/Cargo.toml
+++ b/enum_index/Cargo.toml
@@ -6,16 +6,12 @@ license = "MIT"
 
 description = "Trait and macros for extracting Enum variant index and creating Enum by variant index"
 keywords = ["enum", "macros", "index"]
-categories = ["no-std", "data-structures"]
+categories = ["no-std::no-alloc", "data-structures"]
 
 homepage = "https://github.com/regresscheck/enum_index"
 
 readme = "../README.md"
 
-[features]
-default = ["std"]
-std = []
-
 [dev-dependencies]
 enum_index_derive = "0.2.0"
 #enum_index_derive = { path = "../enum_index_derive"}
diff --git a/enum_index/src/lib.rs b/enum_index/src/lib.rs
index 859b305..37ce71a 100644
--- a/enum_index/src/lib.rs
+++ b/enum_index/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(not(any(feature = "std", test)), no_std)]
+#![no_std]
 
 pub trait EnumIndex {
     fn enum_index(&self) -> usize;