diff --git a/pvlib/iotools/tmy.py b/pvlib/iotools/tmy.py
index be3d8b4b9d..d05218f68b 100644
--- a/pvlib/iotools/tmy.py
+++ b/pvlib/iotools/tmy.py
@@ -211,8 +211,9 @@ def read_tmy3(filename, coerce_year=None, map_variables=None, recolumn=True):
             data = _recolumn(data)
         elif map_variables is None:
             data = _recolumn(data)
-            warnings.warn("recolumn parameter will be retired starting version 0.9.5,"
-                    "please use map_variables parameter instead.",DeprecationWarning)
+            warnings.warn("recolumn parameter will be retired starting version"
+                          "0.9.5, please use map_variables parameter instead.",
+                          DeprecationWarning)
 
     data = data.tz_localize(int(meta['TZ'] * 3600))