diff --git a/src/config.h b/src/config.h
index c1139c0a96..eb86ab5da2 100644
--- a/src/config.h
+++ b/src/config.h
@@ -22,7 +22,7 @@
 #define _CONFIG_H_
 
 #include "rct2.h"
-#include <Windows.h> // for MAX_PATH
+#include <windows.h> // for MAX_PATH
 
 enum {
 	CONFIG_FLAG_ALWAYS_SHOW_GRIDLINES = (1 << 0),
diff --git a/src/screenshot.c b/src/screenshot.c
index cc8d3d84bc..6db7d4f2bb 100644
--- a/src/screenshot.c
+++ b/src/screenshot.c
@@ -30,7 +30,7 @@
 #include "string_ids.h"
 #include "window_error.h"
 
-#include <Windows.h> // For MAX_PATH
+#include <windows.h> // For MAX_PATH
 
 
 static int screenshot_dump_bmp();