diff --git a/flake8/engine.py b/flake8/engine.py
index cd2b62c..8d1ac08 100644
--- a/flake8/engine.py
+++ b/flake8/engine.py
@@ -85,7 +85,8 @@ def get_style_guide(**kwargs):
 
 
 def get_python_version():
-    return '%s %s on %s' % (
-        platform.python_implementation(), platform.python_version(),
-        platform.system()
-    )
+    try:
+        impl = platform.python_implementation()
+    except AttributeError:  # Python 2.5
+        impl = 'Python'
+    return '%s %s on %s' % (impl, platform.python_version(), platform.system())