diff --git a/plugins-root/pst3.c b/plugins-root/pst3.c
index 3954ec5f..b275a6bc 100644
--- a/plugins-root/pst3.c
+++ b/plugins-root/pst3.c
@@ -228,6 +228,7 @@ try_again:
     }
     free(args_vecs);
     free(args);
+    close(as_fd);
     printf("\n");
   }