diff --git a/lib/mfile.cpp b/lib/mfile.cpp
index 5710287d48..93eb6b9c24 100644
--- a/lib/mfile.cpp
+++ b/lib/mfile.cpp
@@ -31,6 +31,7 @@
 #endif
 
 #include "error_numbers.h"
+#include "str_replace.h"
 #include "filesys.h"
 
 #include "mfile.h"