diff --git a/cache.h b/cache.h
index 2c4d9b3776..0d8eddac77 100644
--- a/cache.h
+++ b/cache.h
@@ -527,8 +527,6 @@ static inline int is_absolute_path(const char *path)
 const char *make_absolute_path(const char *path);
 const char *make_nonrelative_path(const char *path);
 const char *make_relative_path(const char *abs, const char *base);
-/* Convert slashes in place. On Windows to backslashes. */
-char *make_native_separator(char *path);
 int normalize_absolute_path(char *buf, const char *path);
 int longest_ancestor_length(const char *path, const char *prefix_list);
 
diff --git a/path.c b/path.c
index 96503d96cd..504eae061f 100644
--- a/path.c
+++ b/path.c
@@ -439,16 +439,3 @@ int longest_ancestor_length(const char *path, const char *prefix_list)
 
 	return max_len;
 }
-
-char *make_native_separator(char* path) {
-#ifdef __MINGW32__
-	char* c;
-	for (c = path; *c; c++) {
-		if (*c == '/')
-			*c = '\\';
-	}
-	return path;
-#else
-	return path;
-#endif
-}