diff --git a/src/libply/ply-terminal-session.c b/src/libply/ply-terminal-session.c
index e7377e97..0bdb985b 100644
--- a/src/libply/ply-terminal-session.c
+++ b/src/libply/ply-terminal-session.c
@@ -148,7 +148,8 @@ ply_terminal_session_free (ply_terminal_session_t *session)
 
   ply_free_string_array (session->argv);
 
-  close (session->pseudoterminal_master_fd);
+  if (session->pseudoterminal_master_fd >= 0)
+    close (session->pseudoterminal_master_fd);
   free (session);
 }