diff --git a/_includes/nav-header.html b/_includes/nav-header.html
index 1a32a7adbef728bcf860397c903baacc3b9d3984..266da15b2e96009647d2497b14c003a34348c6cc 100644
--- a/_includes/nav-header.html
+++ b/_includes/nav-header.html
@@ -102,18 +102,18 @@ function presence() {
         counter ++;
         if(counter < 6) {
           console.log(hash); 
-          $("#presence" ).append('<img class="gravatar" src="https://www.gravatar.com/avatar/'+hash+'.jpg" style="margin-left: -5px;"/>');
-          $("#presence_mobile" ).append('<img class="gravatar" src="https://www.gravatar.com/avatar/'+hash+'.jpg" style="margin-left: -5px;"/>');
+          $("#presence" ).append('<img class="gravatar" src="https://chaotikum.org/images/avatar/'+hash+'.jpg" onerror="this.src=\'https://chaotikum.org/images/avatar/default.png\';" width="80px" height="80px" style="margin-left: -5px;"/>');
+          $("#presence_mobile" ).append('<img class="gravatar" src="https://chaotikum.org/images/avatar/'+hash+'.jpg" onerror="this.src=\'https://chaotikum.org/images/avatar/default.png\';" width="80px" height="80px" style="margin-left: -5px;"/>');
         } 
       }
       if(counter > 5 && counter < 10) {
         plus = counter - 5;
-        $("#presence" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plus'+plus+'.png" style="margin-left: -5px;"/>');
-        $("#presence_mobile" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plus'+plus+'.png" style="margin-left: -5px;"/>');
+        $("#presence" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plus'+plus+'.png" width="80px" height="80px" style="margin-left: -5px;"/>');
+        $("#presence_mobile" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plus'+plus+'.png" width="80px" height="80px" style="margin-left: -5px;"/>');
       }
       if(counter >= 10) {
-        $("#presence" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plusplus.png" style="margin-left: -5px;"/>');
-        $("#presence_mobile" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plusplus.png" style="margin-left: -5px;"/>');
+        $("#presence" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plusplus.png" width="80px" height="80px" style="margin-left: -5px;"/>');
+        $("#presence_mobile" ).append('<img class="gravatar" src="https://chaotikum.org/assets/presence/plusplus.png" width="80px" height="80px" style="margin-left: -5px;"/>');
       }
     });
 }