diff --git a/App.cpp b/App.cpp
index 0868c8a..fc05ba4 100644
--- a/App.cpp
+++ b/App.cpp
@@ -19,8 +19,10 @@ namespace krikkel::NCursesPtyWindow
 
     int App::run()
     {
-        Window *ptyWindow = new Window(
-                Root_Window->lines()
+        std::mutex writeMutex;
+
+        Window *ptyWindow = new Window(&writeMutex
+              , Root_Window->lines()
               , Root_Window->cols()
               , 0
               , 0);
diff --git a/Window.cpp b/Window.cpp
index e5479d1..40eabaa 100644
--- a/Window.cpp
+++ b/Window.cpp
@@ -18,8 +18,8 @@ namespace krikkel::NCursesPtyWindow
     using gsl::narrow;
     using std::lock_guard;
 
-    Window::Window(int lines, int columns, int y, int x)
-            : NCursesWindow(lines, columns, y, x)
+    Window::Window(std::mutex *writeToNCursesMutex, int lines, int columns, int y, int x)
+            : writeToNCursesMutex(writeToNCursesMutex), NCursesWindow(lines, columns, y, x)
     {
         // to get the original terminal we need to shutdown ncurses for a moment
         /// @todo maybe try `reset_prog_mode()` and `reset_shell_mode()` instead
@@ -245,10 +245,13 @@ namespace krikkel::NCursesPtyWindow
         else
             character = *vTermCell.chars;
 
-        setcchar(&converted, &character, formatting, colorPair, NULL);
-        move(cellPosition.row, cellPosition.col);
-        chgat(1, formatting, colorPair, NULL);
-        add_wch(&converted);
+        {
+            lock_guard nCursesLock(*writeToNCursesMutex);
+            setcchar(&converted, &character, formatting, colorPair, NULL);
+            move(cellPosition.row, cellPosition.col);
+            chgat(1, formatting, colorPair, NULL);
+            add_wch(&converted);
+        }
     }
 
     int Window::add_wch(const cchar_t *character)
@@ -263,6 +266,7 @@ namespace krikkel::NCursesPtyWindow
 
     int Window::refresh()
     {
+        lock_guard nCursesLock(*writeToNCursesMutex);
         move(cursorY, cursorX);
         return NCursesWindow::refresh();
     }
@@ -271,7 +275,8 @@ namespace krikkel::NCursesPtyWindow
     ///       resizing?
     int Window::wresize(int rows, int cols)
     {
-        std::lock_guard writeLock(writeToPseudoTerminalMutex);
+        lock_guard nCursesLock(*writeToNCursesMutex);
+        lock_guard writeLock(writeToPseudoTerminalMutex);
         winsize windowSize =
         {
             .ws_row = narrow<unsigned short>(rows)
diff --git a/Window.hpp b/Window.hpp
index d2f03f1..243d063 100644
--- a/Window.hpp
+++ b/Window.hpp
@@ -29,7 +29,7 @@ namespace krikkel::NCursesPtyWindow
     class Window : public NCursesWindow
     {
         public:
-            Window(int lines, int columns, int y, int x);
+            Window(std::mutex *writeToNCursesMutex, int lines, int columns, int y, int x);
             ~Window();
 
             int getFdPtyClient() const;
@@ -49,6 +49,7 @@ namespace krikkel::NCursesPtyWindow
             struct termios terminalParameters;
             VTerm *pseudoTerminal;
             std::mutex writeToPseudoTerminalMutex;
+            std::mutex *writeToNCursesMutex;
             VTermScreen *pseudoTerminalScreen;
             static VTermScreenCallbacks screenCallbacks;
             /// @todo one line is at most 4096 chars long