diff --git a/ffn/core.py b/ffn/core.py
index e55cbac4..a435d16e 100644
--- a/ffn/core.py
+++ b/ffn/core.py
@@ -667,7 +667,7 @@ def plot_histogram(self, freq=None, figsize=(15, 5), title=None, bins=20, **kwar
 
         plt.figure(figsize=figsize)
 
-        if matplotlib.__version__ > "2.":
+        if Version(matplotlib.__version__) >= Version("2"):
             # normed deprecated
             ax = ser.hist(bins=bins, figsize=figsize, density=True, **kwargs)
         else: