diff --git a/src/strings.cpp b/src/strings.cpp
index e6951633c3..862d5b47b9 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -35,6 +35,9 @@
 #include "fontcache.h"
 #include "gui.h"
 #include "strings_func.h"
+#if defined(TTD_BIG_ENDIAN)
+#include "core/endian_func.hpp"
+#endif
 
 /* for opendir/readdir/closedir */
 # include "fios.h"