diff --git a/src/Cedar/Client.c b/src/Cedar/Client.c
index 6fa0a07f..ddc391d6 100644
--- a/src/Cedar/Client.c
+++ b/src/Cedar/Client.c
@@ -1869,6 +1869,7 @@ BEGIN_LISTENER:
 			// If the port cannot be opened
 			if (cn_next_allow <= Tick64())
 			{
+#ifdef  OS_WIN32
 				if (cursor_changed)
 				{
 					// It can be judged to have the rights to open the port
@@ -1876,6 +1877,7 @@ BEGIN_LISTENER:
 					// So, take over the port which is owned by other process forcibly
 					CncReleaseSocket();
 				}
+#endif  // OS_WIN32
 
 				if (cn_listener->Halt)
 				{