diff --git a/Cargo.toml b/Cargo.toml
index d65b3e3..fc0d05f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,9 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+proc-macro = true
+
 [dependencies]
 derive_more = "0.99.17"
 serde = {version = "1.0.150", default-features = false, features = ["derive"]}