diff --git a/console.cpp b/console.cpp
index 3dbaf77..e739496 100644
--- a/console.cpp
+++ b/console.cpp
@@ -88,6 +88,8 @@ int console::wait_char(const int timeout_ms)
 
 void console::flush_input()
 {
+	std::unique_lock<std::mutex> lck(input_lock);
+
 	input_buffer.clear();
 }
 
@@ -229,6 +231,8 @@ void console::operator()()
 		else if (running_flag == false && c == 12)  // ^l
 			refresh_virtual_terminal();
 		else {
+			std::unique_lock<std::mutex> lck(input_lock);
+
 			input_buffer.push_back(c);
 
 			have_data.notify_all();