diff --git a/colorama/ansitowin32.py b/colorama/ansitowin32.py
index 8144d62..62192f7 100644
--- a/colorama/ansitowin32.py
+++ b/colorama/ansitowin32.py
@@ -18,8 +18,8 @@ def is_stream_closed(stream):
 
 
 def is_a_tty(stream):
-    if 'PYCHARM_HOSTED' in os.environ: 
-        return True
+    if 'PYCHARM_HOSTED' in os.environ:
+        return stream is sys.__stdout__ or stream is sys.__stderr__
     return (hasattr(stream, 'isatty') and stream.isatty())