diff --git a/build.rs b/build.rs
index 7c7774b..30f70b9 100644
--- a/build.rs
+++ b/build.rs
@@ -18,6 +18,7 @@ fn main() {
 // creates a cfg alias if `has_feature` is true.
 // `alias` must be a snake case string.
 fn alias(alias: &str, has_feature: bool) {
+    println!("cargo:rustc-check-cfg=cfg({alias})");
     if has_feature {
         println!("cargo:rustc-cfg={alias}");
     }