diff --git a/ptt.c b/ptt.c
index c070e5af..a95ab592 100644
--- a/ptt.c
+++ b/ptt.c
@@ -458,6 +458,8 @@ void export_gpio(int ch, int ot, int invert, int direction)
 	    exit (1);
 	  }
 	}
+	/* Wait for udev adjust permissions */
+	sleep (1);
 	close (fd);
 
 /*