diff --git a/calendar/templates/day_navigation.mustache b/calendar/templates/day_navigation.mustache
index d2c7ecad8fc..065d32532ff 100644
--- a/calendar/templates/day_navigation.mustache
+++ b/calendar/templates/day_navigation.mustache
@@ -41,7 +41,7 @@
             }} data-month="{{previousperiod.mon}}"{{!
             }} data-day="{{previousperiod.mday}}"{{!
         }}>
-            <span class="arrow">{{{larrow}}}</span>
+            <span class="arrow" aria-hidden="true">{{{larrow}}}</span>
             &nbsp;
             <span class="arrow_text">{{previousperiodname}}</span>
         </a>
@@ -58,7 +58,7 @@
         }}>
             <span class="arrow_text">{{nextperiodname}}</span>
             &nbsp;
-            <span class="arrow">{{{rarrow}}}</span>
+            <span class="arrow" aria-hidden="true">{{{rarrow}}}</span>
         </a>
     </div>
 </div>
diff --git a/calendar/templates/month_navigation.mustache b/calendar/templates/month_navigation.mustache
index 89dcfcf13bc..946a0c7fa99 100644
--- a/calendar/templates/month_navigation.mustache
+++ b/calendar/templates/month_navigation.mustache
@@ -41,7 +41,7 @@
             }} data-month="{{previousperiod.mon}}"{{!
             }} data-drop-zone="nav-link" {{!
         }}>
-            <span class="arrow">{{{larrow}}}</span>
+            <span class="arrow" aria-hidden="true">{{{larrow}}}</span>
             &nbsp;
             <span class="arrow_text">{{previousperiodname}}</span>
         </a>
@@ -63,7 +63,7 @@
         }}>
             <span class="arrow_text">{{nextperiodname}}</span>
             &nbsp;
-            <span class="arrow">{{{rarrow}}}</span>
+            <span class="arrow" aria-hidden="true">{{{rarrow}}}</span>
         </a>
     </div>
 </div>
diff --git a/lib/weblib.php b/lib/weblib.php
index 0de326bc066..733ea344b8a 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -2402,7 +2402,7 @@ function link_arrow_right($text, $url='', $accesshide=false, $addclass='', $addp
     if (!$url) {
         $arrowclass .= $addclass;
     }
-    $arrow = '<span class="'.$arrowclass.'">'.$OUTPUT->rarrow().'</span>';
+    $arrow = '<span class="'.$arrowclass.'" aria-hidden="true">'.$OUTPUT->rarrow().'</span>';
     $htmltext = '';
     if ($text) {
         $htmltext = '<span class="arrow_text">'.$text.'</span>&nbsp;';
@@ -2444,7 +2444,7 @@ function link_arrow_left($text, $url='', $accesshide=false, $addclass='', $addpa
     if (! $url) {
         $arrowclass .= $addclass;
     }
-    $arrow = '<span class="'.$arrowclass.'">'.$OUTPUT->larrow().'</span>';
+    $arrow = '<span class="'.$arrowclass.'" aria-hidden="true">'.$OUTPUT->larrow().'</span>';
     $htmltext = '';
     if ($text) {
         $htmltext = '&nbsp;<span class="arrow_text">'.$text.'</span>';