diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 2e734ec7a797171b2fac0ccd68099e8e8720aede..38bf02f6ac440a8e5d2259d3c9e411ba625734bb 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -872,6 +872,7 @@ impl SslContextBuilder {
     ///
     /// This corresponds to `SSL_CTX_set_tmp_ecdh_callback`.
     #[cfg(all(ossl101, not(ossl110)))]
+    #[deprecated(note = "this function leaks memory and does not exist on newer OpenSSL versions")]
     pub fn set_tmp_ecdh_callback<F>(&mut self, callback: F)
     where
         F: Fn(&mut SslRef, bool, u32) -> Result<EcKey<Params>, ErrorStack> + 'static + Sync + Send,
@@ -2581,6 +2582,7 @@ impl SslRef {
     ///
     /// [`SslContextBuilder::set_tmp_ecdh_callback`]: struct.SslContextBuilder.html#method.set_tmp_ecdh_callback
     #[cfg(any(all(ossl101, not(ossl110))))]
+    #[deprecated(note = "this function leaks memory and does not exist on newer OpenSSL versions")]
     pub fn set_tmp_ecdh_callback<F>(&mut self, callback: F)
     where
         F: Fn(&mut SslRef, bool, u32) -> Result<EcKey<Params>, ErrorStack> + 'static + Sync + Send,