diff --git a/lib/_tls_wrap.js b/lib/_tls_wrap.js
index 909f36dd00fe15..324096c282923e 100644
--- a/lib/_tls_wrap.js
+++ b/lib/_tls_wrap.js
@@ -831,10 +831,7 @@ TLSSocket.prototype._init = function(socket, wrap) {
     ssl.handshakes = 0;
 
     if (options.ALPNCallback) {
-      if (typeof options.ALPNCallback !== 'function') {
-        throw new ERR_INVALID_ARG_TYPE('options.ALPNCallback', 'Function', options.ALPNCallback);
-      }
-      assert(typeof options.ALPNCallback === 'function');
+      validateFunction(options.ALPNCallback, 'options.ALPNCallback');
       this[kALPNCallback] = options.ALPNCallback;
       ssl.ALPNCallback = callALPNCallback;
       ssl.enableALPNCb();