diff --git a/mod/lesson/db/install.xml b/mod/lesson/db/install.xml
index 470a172d5ae..29f858fe26e 100644
--- a/mod/lesson/db/install.xml
+++ b/mod/lesson/db/install.xml
@@ -17,7 +17,7 @@
         <FIELD NAME="password" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false"/>
         <FIELD NAME="dependency" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="conditions" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="custom" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="ongoing" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="usemaxgrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
diff --git a/mod/lesson/db/upgrade.php b/mod/lesson/db/upgrade.php
index 3d78bf107dd..1f91609cece 100644
--- a/mod/lesson/db/upgrade.php
+++ b/mod/lesson/db/upgrade.php
@@ -124,5 +124,18 @@ function xmldb_lesson_upgrade($oldversion) {
         // Lesson savepoint reached.
         upgrade_mod_savepoint(true, 2014112300, 'lesson');
     }
+
+    if ($oldversion < 2014122900) {
+
+        // Changing precision of field grade on table lesson to (10).
+        $table = new xmldb_table('lesson');
+        $field = new xmldb_field('grade', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, null, '0', 'conditions');
+
+        // Launch change of precision for field grade.
+        $dbman->change_field_precision($table, $field);
+
+        // Lesson savepoint reached.
+        upgrade_mod_savepoint(true, 2014122900, 'lesson');
+    }
     return true;
 }
diff --git a/mod/lesson/version.php b/mod/lesson/version.php
index ac10eb593a2..1920b7ad33d 100644
--- a/mod/lesson/version.php
+++ b/mod/lesson/version.php
@@ -24,7 +24,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2014112300;       // The current module version (Date: YYYYMMDDXX)
+$plugin->version   = 2014122900;       // The current module version (Date: YYYYMMDDXX)
 $plugin->requires  = 2014110400;    // Requires this Moodle version
 $plugin->component = 'mod_lesson'; // Full name of the plugin (used for diagnostics)
 $plugin->cron      = 0;