diff --git a/datamatrix/__init__.py b/datamatrix/__init__.py
index 186ea62..2a77233 100644
--- a/datamatrix/__init__.py
+++ b/datamatrix/__init__.py
@@ -28,6 +28,6 @@
 from datamatrix._datamatrix._nifticolumn import NiftiColumn
 from datamatrix._datamatrix._datamatrix import DataMatrix
 
-__version__ = '1.0.12'
+__version__ = '1.0.13'
 NAN = float('nan')
 INF = float('inf')
diff --git a/datamatrix/series.py b/datamatrix/series.py
index 78cbd00..d40c6b5 100644
--- a/datamatrix/series.py
+++ b/datamatrix/series.py
@@ -1483,7 +1483,7 @@ def _map(series, fnc_, **kwdict):
     """
 
     f = lambda a: fnc_(a, **kwdict)
-    if isinstance(series, _SeriesColumn):
+    if isinstance(series, _MultiDimensionalColumn):
         return fnc.map_(f, series)
     if isinstance(series, np.ndarray):
         return f(series)