diff --git a/src/osk_gui.cpp b/src/osk_gui.cpp
--- a/src/osk_gui.cpp
+++ b/src/osk_gui.cpp
@@ -325,7 +325,7 @@ static NWidgetBase *MakeSpacebarKeys(int
 
 
 static const NWidgetPart _nested_osk_widgets[] = {
-	NWidget(WWT_CAPTION, COLOUR_GREY, WID_OSK_CAPTION), SetDataTip(STR_WHITE_STRING, STR_NULL),
+	NWidget(WWT_CAPTION, COLOUR_GREY, WID_OSK_CAPTION), SetDataTip(STR_JUST_STRING, STR_NULL), SetTextStyle(TC_WHITE),
 	NWidget(WWT_PANEL, COLOUR_GREY),
 		NWidget(WWT_EDITBOX, COLOUR_GREY, WID_OSK_TEXT), SetMinimalSize(252, 12), SetPadding(2, 2, 2, 2),
 	EndContainer(),