diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 5a386f063b..0c8d8ed014 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -31,8 +31,8 @@
 #include <mutex>
 #include <condition_variable>
 #if defined(__MINGW32__)
-#include "../3rdparty/mingw-std-threads/mingw.mutex.h"
-#include "../3rdparty/mingw-std-threads/mingw.condition_variable.h"
+#include "3rdparty/mingw-std-threads/mingw.mutex.h"
+#include "3rdparty/mingw-std-threads/mingw.condition_variable.h"
 #endif
 
 #include "safeguards.h"