diff --git a/netarch/crypto.py b/netarch/crypto.py
index 52f9a56..7fea047 100644
--- a/netarch/crypto.py
+++ b/netarch/crypto.py
@@ -144,7 +144,7 @@ def freqgraph(f):
     items.sort(cmp2)
 
     for c, n in items:
-        print '%s: %s' % (c, '#' * n)
+        print '%s: %s' % (repr(c), '#' * n)
 
 
 def neighbors(txt):