diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index 664bf1a72c7e8c..798752d74f6ce6 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -162,7 +162,11 @@ template void SSLWrap<TLSWrap>::SetSNIContext(SecureContext* sc);
 template int SSLWrap<TLSWrap>::SetCACerts(SecureContext* sc);
 template SSL_SESSION* SSLWrap<TLSWrap>::GetSessionCallback(
     SSL* s,
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
     unsigned char* key,
+#else
+    const unsigned char *key,
+#endif
     int len,
     int* copy);
 template int SSLWrap<TLSWrap>::NewSessionCallback(SSL* s,
@@ -1394,7 +1398,11 @@ void SSLWrap<Base>::InitNPN(SecureContext* sc) {
 
 template <class Base>
 SSL_SESSION* SSLWrap<Base>::GetSessionCallback(SSL* s,
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
                                                unsigned char* key,
+#else
+                                               const unsigned char* key,
+#endif
                                                int len,
                                                int* copy) {
   Base* w = static_cast<Base*>(SSL_get_app_data(s));
diff --git a/src/node_crypto.h b/src/node_crypto.h
index 3abfe973a79ebd..c3d728fef56a2c 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -232,7 +232,11 @@ class SSLWrap {
   static void AddMethods(Environment* env, v8::Local<v8::FunctionTemplate> t);
 
   static SSL_SESSION* GetSessionCallback(SSL* s,
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
                                          unsigned char* key,
+#else
+                                         const unsigned char* key,
+#endif
                                          int len,
                                          int* copy);
   static int NewSessionCallback(SSL* s, SSL_SESSION* sess);