diff --git a/Cargo.toml b/Cargo.toml
index 61b786f..04f8354 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "generator"
 version = "0.8.3"
 edition = "2021"
-rust-version = "1.77"
+rust-version = "1.73"
 authors = ["Xudong Huang <huangxu008@hotmail.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/Xudong-Huang/generator-rs.git"
diff --git a/build.rs b/build.rs
index 120f911..64a33c8 100644
--- a/build.rs
+++ b/build.rs
@@ -5,8 +5,8 @@ const NIGHTLY: bool = true;
 const NIGHTLY: bool = false;
 
 fn main() {
-    println!("cargo::rustc-check-cfg=cfg(nightly)");
+    println!("cargo:rustc-check-cfg=cfg(nightly)");
     if NIGHTLY {
-        println!("cargo::rustc-cfg=nightly");
+        println!("cargo:rustc-cfg=nightly");
     }
 }