diff --git a/lib/pagelib.php b/lib/pagelib.php
index 7254202fb65..6d34bccff0f 100644
--- a/lib/pagelib.php
+++ b/lib/pagelib.php
@@ -1599,6 +1599,11 @@ class moodle_page {
             $OUTPUT = $this->get_renderer('core', null, $target);
         }
 
+        if (!during_initial_install()) {
+            $filtermanager = filter_manager::instance();
+            $filtermanager->setup_page_for_filters($this, $this->context);
+        }
+
         $this->_wherethemewasinitialised = debug_backtrace();
     }
 
diff --git a/lib/tests/coursecatlib_test.php b/lib/tests/coursecatlib_test.php
index 10b3cdbfee0..4662fcbd9bc 100644
--- a/lib/tests/coursecatlib_test.php
+++ b/lib/tests/coursecatlib_test.php
@@ -451,6 +451,7 @@ class core_coursecatlib_testcase extends advanced_testcase {
 
         try {
             // Enable the multilang filter and set it to apply to headings and content.
+            filter_manager::reset_caches();
             filter_set_global_state('multilang', TEXTFILTER_ON);
             filter_set_applies_to_strings('multilang', true);
             $expected = array($c3, $c4, $c1, $c2);
diff --git a/lib/tests/filelib_test.php b/lib/tests/filelib_test.php
index 1c144535855..ea18b514a2f 100644
--- a/lib/tests/filelib_test.php
+++ b/lib/tests/filelib_test.php
@@ -892,6 +892,7 @@ EOF;
                 get_mimetype_description(array('filename' => 'test.frog')));
 
         // Test custom description using multilang filter.
+        filter_manager::reset_caches();
         filter_set_global_state('multilang', TEXTFILTER_ON);
         filter_set_applies_to_strings('multilang', true);
         core_filetypes::update_type('frog', 'frog', 'application/x-frog', 'document',