1 files changed, 2 insertions, 2 deletions
diff --git a/histlib.h b/histlib.h
index 9986a2e..9627b24 100644
--- a/histlib.h
+++ b/histlib.h
@@ -51,9 +51,9 @@
 #endif
 
 #ifndef member
-#  ifndef strchr
+#  if !defined (strchr) && !defined (__STDC__)
 extern char *strchr ();
-#  endif
+#  endif /* !strchr && !__STDC__ */
 #define member(c, s) ((c) ? ((char *)strchr ((s), (c)) != (char *)NULL) : 0)
 #endif