diff --git a/core/roslib/src/roslib/os_detect.py b/core/roslib/src/roslib/os_detect.py
index c2f995b3..23d6a588 100644
--- a/core/roslib/src/roslib/os_detect.py
+++ b/core/roslib/src/roslib/os_detect.py
@@ -369,7 +369,7 @@ class Override(OSBase):
     def check_presence(self):
         try:
             (self._os_name, self._os_version) = os.environ["ROS_OS_OVERRIDE"].split(':')
-            print >> sys.stderr, "Using environment variable ROS_OS_OVERRIDE=name:version"
+            print >> sys.stderr, "Using environment variable ROS_OS_OVERRIDE name = %s version = %s"%(self._os_name, self._os_version)
             return True
         except:
             return False