diff --git a/AltairZ80/altairz80_defs.h b/AltairZ80/altairz80_defs.h
index ba206717..471f4d83 100644
--- a/AltairZ80/altairz80_defs.h
+++ b/AltairZ80/altairz80_defs.h
@@ -75,7 +75,7 @@
 #define UNIT_CPU_V_SWITCHER     (UNIT_V_UF+6)               /* switcher 8086 <--> 8080/Z80 enabled          */
 #define UNIT_CPU_SWITCHER       (1 << UNIT_CPU_V_SWITCHER)
 
-#if defined (__linux) defined (__linux__) || defined(__NetBSD__) || defined (__OpenBSD__) || defined (__FreeBSD__) || defined (__APPLE__)
+#if defined (__linux) || defined (__linux__) || defined(__NetBSD__) || defined (__OpenBSD__) || defined (__FreeBSD__) || defined (__APPLE__)
 #define UNIX_PLATFORM 1
 #else
 #define UNIX_PLATFORM 0