diff --git a/src/main/java/org/jruby/ext/openssl/SSLContext.java b/src/main/java/org/jruby/ext/openssl/SSLContext.java
index fe24f51e..34364a6f 100644
--- a/src/main/java/org/jruby/ext/openssl/SSLContext.java
+++ b/src/main/java/org/jruby/ext/openssl/SSLContext.java
@@ -249,6 +249,10 @@ public static void createSSLContext(final Ruby runtime, final RubyModule SSL) {
         SSLContext.addReadWriteAttribute(context, "alpn_protocols");
         SSLContext.addReadWriteAttribute(context, "alpn_select_cb");
 
+        SSLContext.addReadWriteAttribute(context, "session_get_cb");
+        SSLContext.addReadWriteAttribute(context, "session_new_cb");
+        SSLContext.addReadWriteAttribute(context, "session_remove_cb");
+
         SSLContext.defineAlias("ssl_timeout", "timeout");
         SSLContext.defineAlias("ssl_timeout=", "timeout=");