diff --git a/src/widget.cpp b/src/widget.cpp
--- a/src/widget.cpp
+++ b/src/widget.cpp
@@ -2367,7 +2367,7 @@ void NWidgetLeaf::Draw(const Window *w)
 
 		case WWT_EDITBOX: {
 			DrawFrameRect(r.left, r.top, r.right, r.bottom, this->colour, FR_LOWERED | FR_DARKENED);
-			const QueryString *query = dynamic_cast<const QueryString*>(w);
+			const QueryString *query = w->GetQueryString(this->index);
 			if (query != NULL) query->DrawEditBox(w, this->index);
 			break;
 		}