diff --git a/src/tls/tls.rs b/src/tls/tls.rs
index 42165a6a..14974bb5 100644
--- a/src/tls/tls.rs
+++ b/src/tls/tls.rs
@@ -77,6 +77,7 @@ where
     }
 }
 
+#[repr(C)]
 pub struct TlsConfig {
     /// Boringssl SSL context.
     tls_ctx: boringssl::tls::Context,