diff --git a/kernel/syscall.c b/kernel/syscall.c
index f0f5521f..7dfee0c4 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -352,6 +352,13 @@ static int sys_dup(int fd)
 	if (BUILTIN_EXPECT((new_fd >= NR_OPEN) || (fd < 0), 0))
 		return new_fd; /* in this case fd = errno */
 
+	/* 
+	 * free the memory which was allocated in get_fildes() 
+	 * cause will link it to another existing memory space
+	 */
+	kfree(curr_task->fildes_table[new_fd], sizeof(fildes_t));
+
+	/* and link it to another existing memory space */
 	curr_task->fildes_table[new_fd] = curr_task->fildes_table[fd];
 	curr_task->fildes_table[fd]->count++;