diff --git a/src/gui/auxiliary/canvas.cpp b/src/gui/auxiliary/canvas.cpp
index 82557e25d5e..bf4d612c7b9 100644
--- a/src/gui/auxiliary/canvas.cpp
+++ b/src/gui/auxiliary/canvas.cpp
@@ -25,8 +25,8 @@
 #include "../../image.hpp"
 #include "foreach.hpp"
 #include "gettext.hpp"
+#include "gui/auxiliary/formula.hpp"
 #include "gui/auxiliary/log.hpp"
-#include "gui/widgets/formula.hpp"
 #include "gui/widgets/helper.hpp"
 #include "../../text.hpp"
 #include "wml_exception.hpp"
diff --git a/src/gui/widgets/formula.hpp b/src/gui/auxiliary/formula.hpp
similarity index 100%
rename from src/gui/widgets/formula.hpp
rename to src/gui/auxiliary/formula.hpp
diff --git a/src/gui/widgets/settings.hpp b/src/gui/widgets/settings.hpp
index 784b2e5aef0..d674c3ef0f4 100644
--- a/src/gui/widgets/settings.hpp
+++ b/src/gui/widgets/settings.hpp
@@ -22,7 +22,7 @@
 
 #include "config.hpp"
 #include "gui/auxiliary/canvas.hpp"
-#include "gui/widgets/formula.hpp"
+#include "gui/auxiliary/formula.hpp"
 #include "gui/widgets/window_builder.hpp"
 #include "tstring.hpp"
 
diff --git a/src/gui/widgets/window.hpp b/src/gui/widgets/window.hpp
index bd4cfb0f5da..a44f1dd29a9 100644
--- a/src/gui/widgets/window.hpp
+++ b/src/gui/widgets/window.hpp
@@ -22,8 +22,8 @@
 #define GUI_WIDGETS_WINDOW_HPP_INCLUDED
 
 #include "cursor.hpp"
+#include "gui/auxiliary/formula.hpp"
 #include "gui/widgets/event_handler.hpp"
-#include "gui/widgets/formula.hpp"
 #include "gui/widgets/helper.hpp"
 #include "gui/widgets/panel.hpp"
 #include "gui/widgets/settings.hpp"
diff --git a/src/gui/widgets/window_builder.hpp b/src/gui/widgets/window_builder.hpp
index 399c4f55bae..d6ec09f6e3c 100644
--- a/src/gui/widgets/window_builder.hpp
+++ b/src/gui/widgets/window_builder.hpp
@@ -15,7 +15,7 @@
 #ifndef GUI_WIDGETS_WINDOW_BUILDER_HPP_INCLUDED
 #define GUI_WIDGETS_WINDOW_BUILDER_HPP_INCLUDED
 
-#include "formula.hpp"
+#include "gui/auxiliary/formula.hpp"
 #include "reference_counted_object.hpp"
 #include "tstring.hpp"