diff --git a/src/window.cc b/src/window.cc
index fd3be30a..1b74f341 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -66,6 +66,12 @@ void Window::update_display_buffer()
     m_display_buffer.optimize();
 }
 
+void Window::set_position(const DisplayCoord& position)
+{
+    m_position.line = std::max(0_line, position.line);
+    m_position.column = std::max(0_char, position.column);
+}
+
 void Window::set_dimensions(const DisplayCoord& dimensions)
 {
     m_dimensions = dimensions;
diff --git a/src/window.hh b/src/window.hh
index 79310ddb..866bb3fb 100644
--- a/src/window.hh
+++ b/src/window.hh
@@ -25,7 +25,7 @@ public:
     ~Window();
 
     const DisplayCoord& position() const { return m_position; }
-    void set_position(const DisplayCoord& position) { m_position = position; }
+    void set_position(const DisplayCoord& position);
 
     const DisplayCoord& dimensions() const { return m_dimensions; }
     void set_dimensions(const DisplayCoord& dimensions);