diff --git a/src/blitter/32bpp_anim_sse4.cpp b/src/blitter/32bpp_anim_sse4.cpp
--- a/src/blitter/32bpp_anim_sse4.cpp
+++ b/src/blitter/32bpp_anim_sse4.cpp
@@ -7,10 +7,10 @@
 
 /** @file 32bpp_anim_sse4.cpp Implementation of the SSE4 32 bpp blitter with animation support. */
 
-#include "palette_func.h"
 #ifdef WITH_SSE
 
 #include "../stdafx.h"
+#include "../palette_func.h"
 #include "../video/video_driver.hpp"
 #include "../table/sprites.h"
 #include "32bpp_anim_sse4.hpp"
diff --git a/src/network/core/os_abstraction.cpp b/src/network/core/os_abstraction.cpp
--- a/src/network/core/os_abstraction.cpp
+++ b/src/network/core/os_abstraction.cpp
@@ -19,6 +19,7 @@
 #include "stdafx.h"
 #include "os_abstraction.h"
 #include "../../string_func.h"
+#include "../../3rdparty/fmt/format.h"
 #include <mutex>
 
 #include "../../safeguards.h"
diff --git a/src/os/windows/library_loader_win.cpp b/src/os/windows/library_loader_win.cpp
--- a/src/os/windows/library_loader_win.cpp
+++ b/src/os/windows/library_loader_win.cpp
@@ -12,6 +12,7 @@
 #include <windows.h>
 
 #include "../../library_loader.h"
+#include "../../3rdparty/fmt/format.h"
 
 #include "../../safeguards.h"