diff --git a/question/type/calculated/question.php b/question/type/calculated/question.php
index 3d6876bf45e..af9c819e6c6 100644
--- a/question/type/calculated/question.php
+++ b/question/type/calculated/question.php
@@ -26,9 +26,9 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 require_once($CFG->dirroot . '/question/type/numerical/question.php');
 
-
 /**
  * Represents a calculated question.
  *
diff --git a/question/type/calculated/questiontype.php b/question/type/calculated/questiontype.php
index b75057b3e87..896def424f5 100644
--- a/question/type/calculated/questiontype.php
+++ b/question/type/calculated/questiontype.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questiontypebase.php');
 require_once($CFG->dirroot . '/question/type/questionbase.php');
 require_once($CFG->dirroot . '/question/type/numerical/question.php');
 
diff --git a/question/type/calculatedmulti/question.php b/question/type/calculatedmulti/question.php
index f93b0f2f658..ab43448c5cd 100644
--- a/question/type/calculatedmulti/question.php
+++ b/question/type/calculatedmulti/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 require_once($CFG->dirroot . '/question/type/multichoice/question.php');
 require_once($CFG->dirroot . '/question/type/calculated/question.php');
 
diff --git a/question/type/description/question.php b/question/type/description/question.php
index e70ff18e7b1..00d85b28c00 100644
--- a/question/type/description/question.php
+++ b/question/type/description/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Represents a description 'question'.
diff --git a/question/type/essay/question.php b/question/type/essay/question.php
index 54f285f8200..d6c2b694369 100644
--- a/question/type/essay/question.php
+++ b/question/type/essay/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Represents an essay question.
diff --git a/question/type/match/question.php b/question/type/match/question.php
index 28c20a22a0a..b373fba6cd2 100644
--- a/question/type/match/question.php
+++ b/question/type/match/question.php
@@ -25,6 +25,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Represents a matching question.
diff --git a/question/type/missingtype/question.php b/question/type/missingtype/question.php
index a46f1bd5b33..fa22cddbfc1 100644
--- a/question/type/missingtype/question.php
+++ b/question/type/missingtype/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * This question definition class is used when the actual question type of this
diff --git a/question/type/missingtype/questiontype.php b/question/type/missingtype/questiontype.php
index 2946d6679f8..81ccbb69a3d 100644
--- a/question/type/missingtype/questiontype.php
+++ b/question/type/missingtype/questiontype.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questiontypebase.php');
 
 /**
  * Missing question type class
diff --git a/question/type/multianswer/question.php b/question/type/multianswer/question.php
index 226d84f81b1..9b6707d85c0 100644
--- a/question/type/multianswer/question.php
+++ b/question/type/multianswer/question.php
@@ -24,6 +24,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 require_once($CFG->dirroot . '/question/type/shortanswer/question.php');
 require_once($CFG->dirroot . '/question/type/numerical/question.php');
 require_once($CFG->dirroot . '/question/type/multichoice/question.php');
diff --git a/question/type/multianswer/questiontype.php b/question/type/multianswer/questiontype.php
index 147ed204759..f7f15c0bc37 100644
--- a/question/type/multianswer/questiontype.php
+++ b/question/type/multianswer/questiontype.php
@@ -26,9 +26,9 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questiontypebase.php');
 require_once($CFG->dirroot . '/question/type/multichoice/question.php');
 
-
 /**
  * The multi-answer question type class.
  *
diff --git a/question/type/multichoice/question.php b/question/type/multichoice/question.php
index a1b12a6035d..2c5e17cdbab 100644
--- a/question/type/multichoice/question.php
+++ b/question/type/multichoice/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Base class for multiple choice questions. The parts that are common to
diff --git a/question/type/numerical/question.php b/question/type/numerical/question.php
index 0071f824c07..c69f4d007fa 100644
--- a/question/type/numerical/question.php
+++ b/question/type/numerical/question.php
@@ -26,6 +26,8 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
+
 /**
  * Represents a numerical question.
  *
diff --git a/question/type/randomsamatch/questiontype.php b/question/type/randomsamatch/questiontype.php
index 5c11f9c342a..bfa210ca076 100644
--- a/question/type/randomsamatch/questiontype.php
+++ b/question/type/randomsamatch/questiontype.php
@@ -25,6 +25,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questiontypebase.php');
 require_once($CFG->dirroot . '/question/type/questionbase.php');
 require_once($CFG->dirroot . '/question/type/numerical/question.php');
 
diff --git a/question/type/shortanswer/question.php b/question/type/shortanswer/question.php
index b1c69ad08d5..e0f4b40d3ec 100644
--- a/question/type/shortanswer/question.php
+++ b/question/type/shortanswer/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Represents a short answer question.
diff --git a/question/type/truefalse/question.php b/question/type/truefalse/question.php
index 5dd77d7b662..d3796a6a821 100644
--- a/question/type/truefalse/question.php
+++ b/question/type/truefalse/question.php
@@ -26,6 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once($CFG->dirroot . '/question/type/questionbase.php');
 
 /**
  * Represents a true-false question.