diff --git a/jedi/debug.py b/jedi/debug.py
index 5c59a7b6..d73a72ae 100644
--- a/jedi/debug.py
+++ b/jedi/debug.py
@@ -3,6 +3,15 @@ import inspect
 import os
 import time
 
+def _lazy_colorama_init():
+    """lazily init colorama if necessary, not to screw up stdout is debug not enabled.
+
+    This version of the function does nothing.
+    """
+    pass
+
+_inited=False
+
 try:
     if os.name == 'nt':
         # does not work on Windows, as pyreadline and colorama interfere
@@ -11,10 +20,19 @@ try:
         # Use colorama for nicer console output.
         from colorama import Fore, init
         from colorama import initialise
-        # pytest resets the stream at the end - causes troubles. Since after
-        # every output the stream is reset automatically we don't need this.
-        initialise.atexit_done = True
-        init()
+        def _lazy_colorama_init():
+            """lazily init colorama if necessary, not to screw up stdout is debug not enabled.
+
+            This version of the function does init colorama.
+            """
+            global _inited
+            if not _inited:
+                # pytest resets the stream at the end - causes troubles. Since after
+                # every output the stream is reset automatically we don't need this.
+                initialise.atexit_done = True
+                init()
+            _inited = True
+
 except ImportError:
     class Fore(object):
         RED = ''
@@ -63,6 +81,7 @@ def dbg(message, *args):
         mod = inspect.getmodule(frm[0])
         if not (mod.__name__ in ignored_modules):
             i = ' ' * _debug_indent
+            _lazy_colorama_init()
             debug_function(NOTICE, i + 'dbg: ' + message % tuple(u(repr(a)) for a in args))
 
 
@@ -81,6 +100,7 @@ def speed(name):
 
 def print_to_stdout(level, str_out):
     """ The default debug function """
+    _lazy_colorama_init()
     if level == NOTICE:
         col = Fore.GREEN
     elif level == WARNING: