diff --git a/.gitattributes b/.gitattributes
index 2e6b2634..2b205bfe 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -581,6 +581,7 @@ install/upgrades/3.0.3~a.sql -text
 install/upgrades/3.0.3~b.sh -text
 install/upgrades/3.1.0~a.sql -text
 install/upgrades/3.1.0~b.php -text
+install/upgrades/3.1.0~c.sh -text
 install/upgrades/3.2.1~a.sql -text
 install/upgrades/3.3.0~a.sql -text
 install/upgrades/README -text
diff --git a/install/upgrades/3.1.0~c.sh b/install/upgrades/3.1.0~c.sh
new file mode 100644
index 00000000..ab5332f7
--- /dev/null
+++ b/install/upgrades/3.1.0~c.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+# Upgrading script to AlternC 3.0.3
+
+CONFIG_FILE="/usr/lib/alternc/functions.sh"
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+
+umask 022
+
+if [ ! -r "$CONFIG_FILE" ]; then
+    echo "Can't access $CONFIG_FILE."
+    exit 1
+fi
+
+if [ `id -u` -ne 0 ]; then
+    echo "3.0.3~b.sh must be launched as root"
+    exit 1
+fi
+
+. "$CONFIG_FILE"
+
+
+#### Migrate zone file of AlternC 1.0 from old directory 
+
+# If no old directory, nothing to do here
+test -d /var/alternc/bind/zones/ || exit 0
+
+# Copy file but do not overwrite them
+cp --no-clobber /var/alternc/bind/zones/* /var/lib/alternc/bind/zones/
+
+# No need to regenerate zone, we are launched by upgrade_check,
+# launched by alternc.install, and alternc.install regenerate everything
+# when it end