Index: openacs-4/packages/acs-subsite/www/shared/portrait-bits.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/shared/portrait-bits.tcl,v
diff -u -N -r1.16 -r1.17
--- openacs-4/packages/acs-subsite/www/shared/portrait-bits.tcl	17 Jan 2019 13:48:20 -0000	1.16
+++ openacs-4/packages/acs-subsite/www/shared/portrait-bits.tcl	17 Jan 2019 13:57:32 -0000	1.17
@@ -14,6 +14,7 @@
 
 # Default avatar image
 set default_avatar [acs_root_dir]/packages/acs-subsite/www/shared/avatar-x50.png
+set default_avatar_mime image/png
 
 #
 # The size info is a valid geometry as provided for image magicks
@@ -33,7 +34,7 @@
         if {[content::item::get -item_id $item_id -array_name itemInfo] == 0} {
             if {[content::item::get -item_id $item_id -array_name itemInfo -revision latest] == 0} {
                 ad_log warning "cannot obtain revision info for item_id $item_id user_id $user_id"
-                ns_returnfile 200 image/png $default_avatar
+                ns_returnfile 200 $default_avatar_mime $default_avatar
                 ad_script_abort
             }
         }
@@ -92,12 +93,12 @@
 
         } else {
             ad_log warning "cannot show portrait with item_id $item_id for user $user_id "
-            ns_returnfile 200 image/png $default_avatar
+            ns_returnfile 200 $default_avatar_mime $default_avatar
         }
     }
 } else {
     # Return default avatar image
-    ns_returnfile 200 image/png $default_avatar
+    ns_returnfile 200 $default_avatar_mime $default_avatar
 }
 
 # Local variables: