diff --git a/lrpar/cttests_macro/Cargo.toml b/lrpar/cttests_macro/Cargo.toml
index 337de62b7..255f07b33 100644
--- a/lrpar/cttests_macro/Cargo.toml
+++ b/lrpar/cttests_macro/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
-proc_macro = true
+proc-macro = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]