diff --git a/src/preferences/fonts/MainWindow.cpp b/src/preferences/fonts/MainWindow.cpp
index cd4032b8ef..03191a3955 100644
--- a/src/preferences/fonts/MainWindow.cpp
+++ b/src/preferences/fonts/MainWindow.cpp
@@ -92,7 +92,9 @@ MainWindow::MainWindow()
 		// make sure window is on screen
 		BScreen screen(this);
 		if (Frame().left > screen.Frame().right - 10
-			|| Frame().top > screen.Frame().bottom - 10)
+			|| Frame().top > screen.Frame().bottom - 10
+			|| Frame().right < screen.Frame().left + 10
+			|| Frame().bottom < screen.Frame().top + 10)
 			_Center();
 	}