diff --git a/build.rs b/build.rs
index 0cfee1a..46d6fd6 100644
--- a/build.rs
+++ b/build.rs
@@ -2,6 +2,8 @@ use std::env;
 
 #[allow(clippy::unusual_byte_groupings)]
 fn main() {
+    println!("cargo:rustc-check-cfg=cfg(ossl102)");
+    println!("cargo:rustc-check-cfg=cfg(ossl111)");
     if let Ok(version) = env::var("DEP_OPENSSL_VERSION_NUMBER") {
         let version = u64::from_str_radix(&version, 16).unwrap();