diff --git a/include/fnmatch.h b/include/fnmatch.h
index 45f45f255ce9..05497d525184 100644
--- a/include/fnmatch.h
+++ b/include/fnmatch.h
@@ -45,6 +45,8 @@
 #define	FNM_PATHNAME	0x02	/* Slash must be matched by slash. */
 #define	FNM_PERIOD	0x04	/* Period must be matched by period. */
 
+#define FNM_NOSYS       -1      /* Reserved */
+
 #if __BSD_VISIBLE
 #define	FNM_LEADING_DIR	0x08	/* Ignore /<tail> after Imatch. */
 #define	FNM_CASEFOLD	0x10	/* Case insensitive search. */