diff --git a/slang/ChangeLog b/slang/ChangeLog
index 7d36fe63b..daad54294 100644
--- a/slang/ChangeLog
+++ b/slang/ChangeLog
@@ -1,3 +1,7 @@
+2005-07-30  Roland Illig  <roland.illig@gmx.de>
+
+	* include/slang.h: Define __unix__ if __MACH__ is defined.
+
 2005-03-19  Pavel S. Shirshov  <me@pavelsh.pp.ru>
 
 	* sldisply.c (SLtt_initialize): Fix typo. Change Is_Bg_BGR,
diff --git a/slang/include/slang.h b/slang/include/slang.h
index 8019aed65..d277fde45 100644
--- a/slang/include/slang.h
+++ b/slang/include/slang.h
@@ -24,7 +24,7 @@
 # endif
 #endif /* __watcomc__ */
 
-#if defined(unix) || defined(__unix) || defined (_AIX) || defined(__NetBSD__)
+#if defined(unix) || defined(__unix) || defined (_AIX) || defined(__NetBSD__) || defined(__MACH__)
 # ifndef __unix__
 #  define __unix__ 1
 # endif