diff --git a/gitinspector/blame.py b/gitinspector/blame.py
index e2e5b5a..ea91384 100644
--- a/gitinspector/blame.py
+++ b/gitinspector/blame.py
@@ -29,6 +29,7 @@ import filtering
 import format
 import gravatar
 import interval
+import json
 import multiprocessing
 import re
 import subprocess
@@ -246,7 +247,7 @@ class BlameOutput(Outputable):
 			blame_xml += "<td>" + "{0:.2f}".format(100.0 * entry[1].comments / entry[1].rows) + "</td>"
 			blame_xml += "<td style=\"display: none\">" + work_percentage + "</td>"
 			blame_xml += "</tr>"
-			chart_data += "{{label: \"{0}\", data: {1}}}".format(entry[0], work_percentage)
+			chart_data += "{{label: {0}, data: {1}}}".format(json.dumps(entry[0]), work_percentage)
 
 			if blames[-1] != entry:
 				chart_data += ", "
diff --git a/gitinspector/changes.py b/gitinspector/changes.py
index dcc8248..2cbc147 100644
--- a/gitinspector/changes.py
+++ b/gitinspector/changes.py
@@ -28,6 +28,7 @@ import filtering
 import format
 import gravatar
 import interval
+import json
 import os
 import subprocess
 import terminal
@@ -238,7 +239,7 @@ class ChangesOutput(Outputable):
 				changes_xml += "<td>" + str(authorinfo.deletions) + "</td>"
 				changes_xml += "<td>" + "{0:.2f}".format(percentage) + "</td>"
 				changes_xml += "</tr>"
-				chart_data += "{{label: \"{0}\", data: {1}}}".format(entry, "{0:.2f}".format(percentage))
+				chart_data += "{{label: {0}, data: {1}}}".format(json.dumps(entry), "{0:.2f}".format(percentage))
 
 				if sorted(authorinfo_list)[-1] != entry:
 					chart_data += ", "