diff --git a/windows/platform.h b/windows/platform.h
index 7e2227b7..2af9b8c4 100644
--- a/windows/platform.h
+++ b/windows/platform.h
@@ -66,6 +66,7 @@ struct Filename {
     char *cpath, *utf8path;
 };
 Filename *filename_from_wstr(const wchar_t *str);
+const wchar_t *filename_to_wstr(const Filename *fn);
 FILE *f_open(const Filename *filename, const char *mode, bool isprivate);
 
 #ifndef SUPERSEDE_FONTSPEC_FOR_TESTING
diff --git a/windows/utils/filename.c b/windows/utils/filename.c
index 8f4c53af..fd494869 100644
--- a/windows/utils/filename.c
+++ b/windows/utils/filename.c
@@ -47,6 +47,11 @@ const char *filename_to_str(const Filename *fn)
     return fn->cpath;                  /* FIXME */
 }
 
+const wchar_t *filename_to_wstr(const Filename *fn)
+{
+    return fn->wpath;
+}
+
 bool filename_equal(const Filename *f1, const Filename *f2)
 {
     /* wpath is primary: two filenames refer to the same file if they