Index: parted-1.8.7/parted/ui.c
===================================================================
--- parted-1.8.7.orig/parted/ui.c
+++ parted-1.8.7/parted/ui.c
@@ -1374,9 +1374,13 @@ init_ui ()
         ped_exception_set_handler (exception_handler);
 
 #ifdef HAVE_LIBREADLINE
-        rl_initialize ();
-        rl_attempted_completion_function = (CPPFunction*) complete_function;
-        readline_state.in_readline = 0;
+	/* check for tty is favorable here because readline might try to set some
+	 * terminal stuff that messes up parsing in non-interactive mode */
+	if( isatty(fileno(stdout)) ) {
+		rl_initialize ();
+		rl_attempted_completion_function = (CPPFunction*) complete_function;
+		readline_state.in_readline = 0;
+	}
 #endif
 
 #ifdef SA_SIGINFO