diff --git a/pypy/tool/ansi_print.py b/pypy/tool/ansi_print.py
index 3eff27c..fac4ba2 100644
--- a/pypy/tool/ansi_print.py
+++ b/pypy/tool/ansi_print.py
@@ -25,7 +25,7 @@ class AnsiLog:
         self.kw_to_color = self.KW_TO_COLOR.copy()
         self.kw_to_color.update(kw_to_color)
         self.file = file
-        self.fancy = True
+        self.fancy = False
         self.isatty = getattr(sys.stderr, 'isatty', lambda: False)
         if self.fancy and self.isatty(): 
             self.mandelbrot_driver = Driver()