diff --git a/src/widget.cpp b/src/widget.cpp
--- a/src/widget.cpp
+++ b/src/widget.cpp
@@ -2107,7 +2107,7 @@ Dimension NWidgetLeaf::dropdown_dimensio
  * @param data   Data of the widget.
  * @param tip    Tooltip of the widget.
  */
-NWidgetLeaf::NWidgetLeaf(WidgetType tp, Colours colour, int index, uint16 data, StringID tip) : NWidgetCore(tp, colour, 1, 1, data, tip)
+NWidgetLeaf::NWidgetLeaf(WidgetType tp, Colours colour, int index, uint32 data, StringID tip) : NWidgetCore(tp, colour, 1, 1, data, tip)
 {
 	assert(index >= 0 || tp == WWT_LABEL || tp == WWT_TEXT || tp == WWT_CAPTION || tp == WWT_RESIZEBOX || tp == WWT_SHADEBOX || tp == WWT_DEFSIZEBOX || tp == WWT_DEBUGBOX || tp == WWT_STICKYBOX || tp == WWT_CLOSEBOX);
 	if (index >= 0) this->SetIndex(index);
diff --git a/src/widget_type.h b/src/widget_type.h
--- a/src/widget_type.h
+++ b/src/widget_type.h
@@ -769,7 +769,7 @@ private:
  */
 class NWidgetLeaf : public NWidgetCore {
 public:
-	NWidgetLeaf(WidgetType tp, Colours colour, int index, uint16 data, StringID tip);
+	NWidgetLeaf(WidgetType tp, Colours colour, int index, uint32 data, StringID tip);
 
 	/* virtual */ void SetupSmallestSize(Window *w, bool init_array);
 	/* virtual */ void Draw(const Window *w);
@@ -856,7 +856,7 @@ static inline uint ComputeMaxSize(uint b
  * @ingroup NestedWidgetParts
  */
 struct NWidgetPartDataTip {
-	uint16 data;      ///< Data value of the widget.
+	uint32 data;      ///< Data value of the widget.
 	StringID tooltip; ///< Tooltip of the widget.
 };
 
@@ -1011,7 +1011,7 @@ static inline NWidgetPart EndContainer()
  * @param tip  Tooltip of the widget.
  * @ingroup NestedWidgetParts
  */
-static inline NWidgetPart SetDataTip(uint16 data, StringID tip)
+static inline NWidgetPart SetDataTip(uint32 data, StringID tip)
 {
 	NWidgetPart part;