diff --git a/securedrop-workstation-config/debian/postinst b/securedrop-workstation-config/debian/postinst
index 4717d77e..2084a52f 100644
--- a/securedrop-workstation-config/debian/postinst
+++ b/securedrop-workstation-config/debian/postinst
@@ -28,6 +28,7 @@ case "$1" in
       systemctl restart paxctld
       cp /opt/sdw/open-in-dvm.desktop /usr/share/applications/
       cp /opt/sdw/mimeapps.list.sd-app /usr/share/applications/mimeapps.list
+      cp /opt/sdw/mimeapps.list.sd-app /opt/sdw/mimeapps.list.default
     fi
     ;;
 
diff --git a/securedrop-workstation-config/debian/securedrop-workstation-config.install b/securedrop-workstation-config/debian/securedrop-workstation-config.install
index 913ce5d1..5301fe0d 100644
--- a/securedrop-workstation-config/debian/securedrop-workstation-config.install
+++ b/securedrop-workstation-config/debian/securedrop-workstation-config.install
@@ -1,6 +1,5 @@
 mimeapps.list.sd-viewer opt/sdw/
 mimeapps.list.sd-app opt/sdw/
-mimeapps.list.sd-app opt/sdw/mimeapps.list.default
 mimeapps.list.sd-devices-dvm opt/sdw/
 open-in-dvm.desktop opt/sdw/
 paxctld.conf opt/sdw/