diff --git a/dir.c b/dir.c
index 76c108a4a9..8c6d6fea56 100644
--- a/dir.c
+++ b/dir.c
@@ -187,12 +187,18 @@ has_nonascii(const char *ptr, size_t len)
 # define IF_NORMALIZE_UTF8PATH(something) /* nothing */
 #endif
 
-#ifndef IFTODT
+#if defined(IFTODT) && defined(DT_UNKNOWN)
+# define EMULATE_IFTODT 0
+#else
+# define EMULATE_IFTODT 1
+#endif
+
+#if EMULATE_IFTODT
 # define IFTODT(m)	(((m) & S_IFMT) / ((~S_IFMT & (S_IFMT-1)) + 1))
 #endif
 
 typedef enum {
-#ifdef DT_UNKNOWN
+#if !EMULATE_IFTODT
     path_exist     = DT_UNKNOWN,
     path_directory = DT_DIR,
     path_regular   = DT_REG,