diff --git a/tailbone/diffs.py b/tailbone/diffs.py
index f388cc3f..f179128f 100644
--- a/tailbone/diffs.py
+++ b/tailbone/diffs.py
@@ -35,12 +35,13 @@ class Diff(object):
     Core diff class.  In sore need of documentation.
     """
 
-    def __init__(self, old_data, new_data, columns=None, fields=None, render_value=None):
+    def __init__(self, old_data, new_data, columns=None, fields=None, render_value=None, monospace=False):
         self.old_data = old_data
         self.new_data = new_data
         self.columns = columns or ["field name", "old value", "new value"]
         self.fields = fields or self.make_fields()
         self.render_value = render_value or self.render_value_default
+        self.monospace = monospace
 
     def make_fields(self):
         return sorted(set(self.old_data) | set(self.new_data), key=lambda x: x.lower())
diff --git a/tailbone/static/css/diffs.css b/tailbone/static/css/diffs.css
index 66bf4064..f76b336d 100644
--- a/tailbone/static/css/diffs.css
+++ b/tailbone/static/css/diffs.css
@@ -16,8 +16,8 @@ table.diff td {
     padding: 2px 5px;
 }
 
-table.diff td.old-value,
-table.diff td.new-value{
+table.diff.monospace td.old-value,
+table.diff.monospace td.new-value{
     font-family: monospace;
     white-space: pre;
 }
diff --git a/tailbone/templates/diff.mako b/tailbone/templates/diff.mako
index 2ac2796f..7f2132fd 100644
--- a/tailbone/templates/diff.mako
+++ b/tailbone/templates/diff.mako
@@ -1,5 +1,5 @@
 ## -*- coding: utf-8; -*-
-<table class="diff">
+<table class="diff${' monospace' if diff.monospace else ''}">
   <thead>
     <tr>
       % for column in diff.columns: