diff --git a/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java b/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
index 079e875d..793a487b 100644
--- a/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
+++ b/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
@@ -137,7 +137,7 @@ protected WolfSSLEngineHelper(WolfSSLSession ssl, WolfSSLAuthStore store,
             WolfSSLParameters params, int port, String hostname)
             throws WolfSSLException {
 
-        if (params == null || ssl == null || store == null) {
+        if (params == null || ssl == null || store == null || port < 0) {
             throw new WolfSSLException("Bad argument");
         }
 
@@ -165,8 +165,7 @@ protected WolfSSLEngineHelper(WolfSSLSession ssl, WolfSSLAuthStore store,
             WolfSSLParameters params, int port, InetAddress peerAddr)
             throws WolfSSLException {
 
-        if (params == null || ssl == null || store == null ||
-            peerAddr == null) {
+        if (params == null || ssl == null || store == null || peerAddr == null || port < 0) {
             throw new WolfSSLException("Bad argument");
         }