diff --git a/lib/tests/behat/behat_general.php b/lib/tests/behat/behat_general.php
index d8d5264991a..2cdd394145a 100644
--- a/lib/tests/behat/behat_general.php
+++ b/lib/tests/behat/behat_general.php
@@ -982,7 +982,7 @@ class behat_general extends behat_base {
      * Example: I change window size to "small" or I change window size to "1024x768"
      *
      * @throws ExpectationException
-     * @Then /^I change window size to "([^"](small|medium|large|\d+x\d+))"$/
+     * @Then /^I change window size to "(small|medium|large|\d+x\d+)"$/
      * @param string $windowsize size of the window (small|medium|large|wxh).
      */
     public function i_change_window_size_to($windowsize) {
diff --git a/mod/assign/feedback/editpdf/tests/behat/annotate_pdf.feature b/mod/assign/feedback/editpdf/tests/behat/annotate_pdf.feature
index b49f6807877..d047b5c3186 100644
--- a/mod/assign/feedback/editpdf/tests/behat/annotate_pdf.feature
+++ b/mod/assign/feedback/editpdf/tests/behat/annotate_pdf.feature
@@ -131,6 +131,7 @@ Feature: In an assignment, teacher can annotate PDF files during grading
     And I follow "View/grade all submissions"
     And I click on "Grade" "link" in the "Student 2" "table_row"
     And I follow "Launch PDF editor..."
+    And I change window size to "large"
     And I click on ".stampbutton" "css_element"
     And I click on ".drawingcanvas" "css_element"
     And I click on "Close" "button"
diff --git a/mod/assign/feedback/editpdf/tests/behat/group_annotations.feature b/mod/assign/feedback/editpdf/tests/behat/group_annotations.feature
index 1bdb027afb1..31fc64fc490 100644
--- a/mod/assign/feedback/editpdf/tests/behat/group_annotations.feature
+++ b/mod/assign/feedback/editpdf/tests/behat/group_annotations.feature
@@ -53,6 +53,7 @@ Feature: In a group assignment, teacher can annotate PDF files for all users
     And I follow "View/grade all submissions"
     And I click on "Grade" "link" in the "Submitted for grading" "table_row"
     And I follow "Launch PDF editor..."
+    And I change window size to "large"
     And I click on ".navigate-next-button" "css_element"
     And I click on ".stampbutton" "css_element"
     And I click on ".drawingcanvas" "css_element"