diff --git a/src/ascii.h b/src/ascii.h
index 4ab3518..b920d41 100644
--- a/src/ascii.h
+++ b/src/ascii.h
@@ -177,23 +177,17 @@
  * Character that separates dir names in a path.
  * For MS-DOS, WIN32 and OS/2 we use a backslash.  A slash mostly works
  * fine, but there are places where it doesn't (e.g. in a command name).
- * For Macintosh we use a colon.
  * For Acorn we use a dot.
  */
 #ifdef BACKSLASH_IN_FILENAME
 # define PATHSEP	psepc
 # define PATHSEPSTR	pseps
 #else
-# ifdef COLON_AS_PATHSEP
-#  define PATHSEP	':'
-#  define PATHSEPSTR	":"
+# ifdef RISCOS
+#  define PATHSEP	'.'
+#  define PATHSEPSTR	"."
 # else
-#  ifdef RISCOS
-#   define PATHSEP	'.'
-#   define PATHSEPSTR	"."
-#  else
-#   define PATHSEP	'/'
-#   define PATHSEPSTR	"/"
-#  endif
+#  define PATHSEP	'/'
+#  define PATHSEPSTR	"/"
 # endif
 #endif