diff --git a/src/cpp/_nix_based/jssc.cpp b/src/cpp/_nix_based/jssc.cpp
index 230e248..e9de916 100644
--- a/src/cpp/_nix_based/jssc.cpp
+++ b/src/cpp/_nix_based/jssc.cpp
@@ -72,6 +72,7 @@ JNIEXPORT jlong JNICALL Java_jssc_SerialNativeInterface_openPort(JNIEnv *env, jo
             fcntl(hComm, F_SETFL, flags);
         }
         else {
+            close(hComm);
             hComm = jssc_SerialNativeInterface_ERR_INCORRECT_SERIAL_PORT;//-4;
         }
         delete settings;
diff --git a/src/cpp/windows/jssc.c++ b/src/cpp/windows/jssc.c++
index dae4980..7d9b095 100644
--- a/src/cpp/windows/jssc.c++
+++ b/src/cpp/windows/jssc.c++
@@ -57,6 +57,7 @@ JNIEXPORT jlong JNICALL Java_jssc_SerialNativeInterface_openPort(JNIEnv *env, jo
     if(hComm != INVALID_HANDLE_VALUE){
     	DCB *dcb = new DCB();
     	if(!GetCommState(hComm, dcb)){
+    		CloseHandle(hComm);
     		hComm = (HANDLE)jssc_SerialNativeInterface_ERR_INCORRECT_SERIAL_PORT;//(-4)Incorrect serial port
     	}
     	delete dcb;