diff --git a/openssl-sys/src/tls1.rs b/openssl-sys/src/tls1.rs
index 86c6c8f35aae1bfe71e3d269f4b44db3088c8f4a..d02f5c049748edc4ccdccfe4aaed17b38702c27e 100644
--- a/openssl-sys/src/tls1.rs
+++ b/openssl-sys/src/tls1.rs
@@ -7,7 +7,7 @@ use *;
 pub const TLS1_VERSION: c_int = 0x301;
 pub const TLS1_1_VERSION: c_int = 0x302;
 pub const TLS1_2_VERSION: c_int = 0x303;
-#[cfg(ossl111)]
+#[cfg(any(ossl111, libressl340))]
 pub const TLS1_3_VERSION: c_int = 0x304;
 
 pub const TLS1_AD_DECODE_ERROR: c_int = 50;
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 7443066961acb30da3ede971407287d0685c4134..6896a22f1067ec8cedc5446e9a12a4213ac8decd 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -611,8 +611,8 @@ impl SslVersion {
 
     /// TLSv1.3
     ///
-    /// Requires OpenSSL 1.1.1 or newer.
-    #[cfg(ossl111)]
+    /// Requires OpenSSL 1.1.1 or LibreSSL 3.4.0 or newer.
+    #[cfg(any(ossl111, libressl340))]
     pub const TLS1_3: SslVersion = SslVersion(ffi::TLS1_3_VERSION);
 }