diff --git a/libs/main/io_devices/piserial.cpp b/libs/main/io_devices/piserial.cpp
index 401d5dfc..0adecd95 100644
--- a/libs/main/io_devices/piserial.cpp
+++ b/libs/main/io_devices/piserial.cpp
@@ -1292,6 +1292,11 @@ PIVector<PISerial::DeviceInfo> PISerial::availableDevicesInfo(bool test) {
 			if (!rok) {
 				ret.remove(i);
 				--i;
+#ifdef WINDOWS
+				CloseHandle(hComm);
+#else
+				::close(fd);
+#endif
 				continue;
 			}
 #ifdef WINDOWS