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()