diff --git a/src/genworld.cpp b/src/genworld.cpp
index 02d9cab050..f768e39af5 100644
--- a/src/genworld.cpp
+++ b/src/genworld.cpp
@@ -12,7 +12,6 @@
 #include "stdafx.h"
 #include "landscape.h"
 #include "company_func.h"
-#include "thread/thread.h"
 #include "genworld.h"
 #include "gfxinit.h"
 #include "window_func.h"
diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index f08d320946..137b69515e 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -25,7 +25,6 @@
 #include "landscape_type.h"
 #include "querystring_gui.h"
 #include "town.h"
-#include "thread/thread.h"
 #include "settings_func.h"
 #include "core/geometry_func.hpp"
 #include "core/random_func.hpp"
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 6933391820..69bcf6f7ab 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -18,7 +18,6 @@
 #include "newgrf_text.h"
 #include "window_func.h"
 #include "progress.h"
-#include "thread/thread.h"
 #include "video/video_driver.hpp"
 
 #include "fileio_func.h"
diff --git a/src/progress.h b/src/progress.h
index dd4f32420a..85a27de726 100644
--- a/src/progress.h
+++ b/src/progress.h
@@ -12,6 +12,8 @@
 #ifndef PROGRESS_H
 #define PROGRESS_H
 
+#include "thread/thread.h"
+
 static const uint MODAL_PROGRESS_REDRAW_TIMEOUT = 200; ///< Timeout between redraws
 
 /**