diff --git a/mod/survey/save.php b/mod/survey/save.php
index b6934bfa20e..228c932fd0f 100644
--- a/mod/survey/save.php
+++ b/mod/survey/save.php
@@ -30,7 +30,7 @@
 
 // Make sure this is a legitimate posting
 
-    if (!$formdata = data_submitted()) {
+    if (!$formdata = data_submitted() or !confirm_sesskey()) {
         print_error('cannotcallscript');
     }
 
diff --git a/mod/survey/view.php b/mod/survey/view.php
index 45a484140ef..6b84b6b0659 100644
--- a/mod/survey/view.php
+++ b/mod/survey/view.php
@@ -135,6 +135,7 @@
     echo "<form method=\"post\" action=\"save.php\" id=\"surveyform\">";
     echo '<div>';
     echo "<input type=\"hidden\" name=\"id\" value=\"$id\" />";
+    echo "<input type=\"hidden\" name=\"sesskey\" value=\"".sesskey()."\" />";
 
     echo $OUTPUT->box(format_module_intro('survey', $survey, $cm->id), 'generalbox boxaligncenter bowidthnormal', 'intro');