diff --git a/libs/pbd/system_exec.cc b/libs/pbd/system_exec.cc
index 98324039a6..0102323505 100644
--- a/libs/pbd/system_exec.cc
+++ b/libs/pbd/system_exec.cc
@@ -297,6 +297,9 @@ void
 SystemExec::terminate ()
 {
 	::pthread_mutex_lock(&write_lock);
+
+	close_stdin();
+
 	if (pid) {
 		/* terminate */
 		EnumWindows(my_terminateApp, (LPARAM)pid->dwProcessId);