diff --git a/build.rs b/build.rs
index f0b6f7d..4f9f63b 100644
--- a/build.rs
+++ b/build.rs
@@ -22,8 +22,8 @@ fn main() {
             println!("cargo:rustc-cfg=have_min_max_version");
         }
 
-        // TLS 1.3 requires libressl 3.2
-        if version >= 0x3_02_01_00_0 {
+        // TLS 1.3 requires libressl 3.4.0
+        if version >= 0x3_04_00_00_0 {
             println!("cargo:rustc-cfg=have_tls13_version");
         }
     }
diff --git a/src/imp/schannel.rs b/src/imp/schannel.rs
index faeb5dc..62e5042 100644
--- a/src/imp/schannel.rs
+++ b/src/imp/schannel.rs
@@ -19,7 +19,6 @@ static PROTOCOLS: &'static [Protocol] = &[
     Protocol::Tls10,
     Protocol::Tls11,
     Protocol::Tls12,
-    Protocol::Tls13,
 ];
 
 fn convert_protocols(min: Option<::Protocol>, max: Option<::Protocol>) -> &'static [Protocol] {
diff --git a/src/imp/security_framework.rs b/src/imp/security_framework.rs
index 8a2489d..f56a916 100644
--- a/src/imp/security_framework.rs
+++ b/src/imp/security_framework.rs
@@ -49,7 +49,6 @@ fn convert_protocol(protocol: Protocol) -> SslProtocol {
         Protocol::Tlsv10 => SslProtocol::TLS1,
         Protocol::Tlsv11 => SslProtocol::TLS11,
         Protocol::Tlsv12 => SslProtocol::TLS12,
-        Protocol::Tlsv13 => SslProtocol::TLS13,
     }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index 3fb5f2b..8a3c4d1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -323,7 +323,7 @@ pub enum Protocol {
     /// The TLS 1.2 protocol.
     Tlsv12,
     /// The TLS 1.3 protocol.
-    #[cfg(any(target_os = "macos", target_os = "windows", target_os = "ios", have_tls13_version))]
+    #[cfg(have_tls13_version)]
     Tlsv13,
 }