diff --git a/C/sysbits.c b/C/sysbits.c
index 55ef3c7bf..81fa48785 100644
--- a/C/sysbits.c
+++ b/C/sysbits.c
@@ -2643,10 +2643,14 @@ p_unix(void)
 #else
 #ifdef __unix__
   return TRUE;
+#else
+#ifdef __APPLE__
+  return TRUE;
 #else
   return FALSE;
 #endif
 #endif
+#endif
 }
 
 static Int