diff --git a/include/fnmatch.h b/include/fnmatch.h
index 21d6da4ed81a..3958338c11a9 100644
--- a/include/fnmatch.h
+++ b/include/fnmatch.h
@@ -45,7 +45,9 @@
 #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 __XSI_VISIBLE
+#define	FNM_NOSYS	-1	/* Reserved. */
+#endif
 
 #if __BSD_VISIBLE
 #define	FNM_LEADING_DIR	0x08	/* Ignore /<tail> after Imatch. */
diff --git a/include/regex.h b/include/regex.h
index a362dc05a2d4..5c13afea4159 100644
--- a/include/regex.h
+++ b/include/regex.h
@@ -75,7 +75,7 @@ typedef struct {
 #define	REG_DUMP	0200
 
 /* regerror() flags */
-#define	REG_ENOSYS	-1	/* Reserved */
+#define	REG_ENOSYS	-1
 #define	REG_NOMATCH	 1
 #define	REG_BADPAT	 2
 #define	REG_ECOLLATE	 3