diff --git a/src/signs_gui.cpp b/src/signs_gui.cpp
--- a/src/signs_gui.cpp
+++ b/src/signs_gui.cpp
@@ -263,7 +263,7 @@ struct SignListWindow : Window, SignList
 			case WID_SIL_LIST: {
 				Dimension spr_dim = GetSpriteSize(SPR_COMPANY_ICON);
 				this->text_offset = WD_FRAMETEXT_LEFT + spr_dim.width + 2; // 2 pixels space between icon and the sign text.
-				resize->height = max<uint>(FONT_HEIGHT_NORMAL, spr_dim.height);
+				resize->height = std::max<uint>(FONT_HEIGHT_NORMAL, spr_dim.height);
 				Dimension d = {(uint)(this->text_offset + WD_FRAMETEXT_RIGHT), WD_FRAMERECT_TOP + 5 * resize->height + WD_FRAMERECT_BOTTOM};
 				*size = maxdim(*size, d);
 				break;