diff --git a/src/vim.h b/src/vim.h
index 88d4850..898ebb6 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2485,4 +2485,8 @@
 #define FNE_INCL_BR	1	/* include [] in name */
 #define FNE_CHECK_START	2	/* check name starts with valid character */
 
+#if (defined(sun) || defined(__FreeBSD__)) && defined(S_ISCHR)
+# define OPEN_CHR_FILES
+#endif
+
 #endif /* VIM__H */