diff --git a/src/addons/mod/lesson/tests/behat/numerical_decimal_separator-311.feature b/src/addons/mod/lesson/tests/behat/numerical_decimal_separator-311.feature
index 5f9977ab5..16ce86941 100755
--- a/src/addons/mod/lesson/tests/behat/numerical_decimal_separator-311.feature
+++ b/src/addons/mod/lesson/tests/behat/numerical_decimal_separator-311.feature
@@ -19,6 +19,7 @@ Feature: Test decimal separators in lesson
       | lesson   | Offline lesson | Offline lesson descr | C1     | lesson   | 1           | 1      | 9           | 1      | 1                    |
     # Currently there are no generators for pages. See MDL-77581.
     And I log in as "teacher1"
+    And I change window size to "small"
     And I am on "Course 1" course homepage
     And I follow "Basic lesson"
     And I follow "Add a question page"
diff --git a/src/addons/mod/lesson/tests/behat/numerical_decimal_separator.feature b/src/addons/mod/lesson/tests/behat/numerical_decimal_separator.feature
index f37882d91..f48b65814 100755
--- a/src/addons/mod/lesson/tests/behat/numerical_decimal_separator.feature
+++ b/src/addons/mod/lesson/tests/behat/numerical_decimal_separator.feature
@@ -19,6 +19,7 @@ Feature: Test decimal separators in lesson
       | lesson   | Offline lesson | Offline lesson descr | C1     | lesson   | 1           | 1      | 9           | 1      | 1                    |
     # Currently there are no generators for pages. See MDL-77581.
     And I log in as "teacher1"
+    And I change window size to "small"
     And I am on "Course 1" course homepage
     And I follow "Basic lesson"
     And I follow "Add a question page"