diff --git a/src/bin/zip/ttyio.h b/src/bin/zip/ttyio.h
index 2b0e94252e..43f40c7f9f 100644
--- a/src/bin/zip/ttyio.h
+++ b/src/bin/zip/ttyio.h
@@ -58,7 +58,7 @@
 #  endif
 #endif
 
-#if (defined(__ATHEOS__) || (defined(__BEOS__) || defined(__HAIKU__)) || defined(UNIX))
+#if (defined(__ATHEOS__) || defined(__BEOS__) || defined(__HAIKU__) || defined(UNIX))
 #  ifndef ATH_BEO_UNX
 #    define ATH_BEO_UNX
 #  endif