diff --git a/modules/core/src/main/java/org/apache/ignite/internal/processors/port/GridPortProcessor.java b/modules/core/src/main/java/org/apache/ignite/internal/processors/port/GridPortProcessor.java
index b58f1c6bfbcf8..22bf3a6530a5b 100644
--- a/modules/core/src/main/java/org/apache/ignite/internal/processors/port/GridPortProcessor.java
+++ b/modules/core/src/main/java/org/apache/ignite/internal/processors/port/GridPortProcessor.java
@@ -76,7 +76,7 @@ public GridPortProcessor(GridKernalContext ctx) {
      * @param cls Class.
      */
     public void registerPort(int port, IgnitePortProtocol proto, Class cls) {
-        assert port > 0 && port < 65535;
+        assert port > 0 && port <= 65535;
         assert proto != null;
         assert cls != null;
 
@@ -115,7 +115,7 @@ public void deregisterPorts(Class cls) {
      * @param cls Class.
      */
     public void deregisterPort(int port, IgnitePortProtocol proto, Class cls) {
-        assert port > 0 && port < 65535;
+        assert port > 0 && port <= 65535;
         assert proto != null;
         assert cls != null;