diff --git a/_graph_templates/28days.png.xml b/_graph_templates/28days.png.xml
index e608500..7f5a78b 100644
--- a/_graph_templates/28days.png.xml
+++ b/_graph_templates/28days.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <size>600, 800</size>
   <fileformat>pngcairo font "arial,8"</fileformat>
   <duration>weeks=4</duration>
diff --git a/_graph_templates/28days.svg.xml b/_graph_templates/28days.svg.xml
index 74b4e4c..b471d8f 100644
--- a/_graph_templates/28days.svg.xml
+++ b/_graph_templates/28days.svg.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <size>600, 800</size>
   <fileformat>svg font "arial,10"</fileformat>
   <duration>weeks=4</duration>
diff --git a/_graph_templates/7days.png.xml b/_graph_templates/7days.png.xml
index 137982a..b7badb2 100644
--- a/_graph_templates/7days.png.xml
+++ b/_graph_templates/7days.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <size>600, 800</size>
   <fileformat>pngcairo font "arial,8"</fileformat>
   <duration>weeks=1</duration>
diff --git a/_graph_templates/7days.svg.xml b/_graph_templates/7days.svg.xml
index 902d4e3..ed5380e 100644
--- a/_graph_templates/7days.svg.xml
+++ b/_graph_templates/7days.svg.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <size>600, 800</size>
   <fileformat>svg font "arial,10"</fileformat>
   <duration>weeks=1</duration>
diff --git a/_graph_templates/humidex.png.xml b/_graph_templates/humidex.png.xml
index 97ad9a3..9db7872 100644
--- a/_graph_templates/humidex.png.xml
+++ b/_graph_templates/humidex.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <!--
   pywws - Python software for USB Wireless Weather Stations
   http://github.com/jim-easterbrook/pywws
diff --git a/_graph_templates/rose_24hrs.png.xml b/_graph_templates/rose_24hrs.png.xml
index e9e2388..7040be7 100644
--- a/_graph_templates/rose_24hrs.png.xml
+++ b/_graph_templates/rose_24hrs.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <fileformat>pngcairo font "arial,8"</fileformat>
   <title>Wind über die letzten 24h (km/h)</title>
   <duration>hours=24</duration>
diff --git a/_graph_templates/rose_24hrs.svg.xml b/_graph_templates/rose_24hrs.svg.xml
index 074febd..0316711 100644
--- a/_graph_templates/rose_24hrs.svg.xml
+++ b/_graph_templates/rose_24hrs.svg.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <fileformat>svg font "arial,10"</fileformat>
   <title>Wind über die letzten 24h (km/h)</title>
   <duration>hours=24</duration>
diff --git a/_graph_templates/rose_7days_nights.png.xml b/_graph_templates/rose_7days_nights.png.xml
index 83aac1d..439d8d0 100644
--- a/_graph_templates/rose_7days_nights.png.xml
+++ b/_graph_templates/rose_7days_nights.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <title>Wind über die letzten 7 Tage (km/h)</title>
   <fileformat>pngcairo font "arial,8"</fileformat>
   <duration>hours=24 * 7</duration>
diff --git a/_graph_templates/rose_7days_nights.svg.xml b/_graph_templates/rose_7days_nights.svg.xml
index 798152f..0aabaf3 100644
--- a/_graph_templates/rose_7days_nights.svg.xml
+++ b/_graph_templates/rose_7days_nights.svg.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <title>Wind über die letzten 7 Tage (km/h)</title>
   <fileformat>svg font "arial,10"</fileformat>
   <duration>hours=24 * 7</duration>
diff --git a/_graph_templates/tweet.png.xml b/_graph_templates/tweet.png.xml
index a05f234..43aff9c 100644
--- a/_graph_templates/tweet.png.xml
+++ b/_graph_templates/tweet.png.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<graph>
+<graph xmlns:xi="http://www.w3.org/2001/XInclude">
   <size>400, 220</size>
   <fileformat>pngcairo font "arial,8"</fileformat>
   <lmargin>6</lmargin>