diff --git a/Dockerfile b/Dockerfile
index 238cb041e7a840d8d88dacc77f09568d52ba7db4..04f950fd727e7c41f44357be6dfefd62cef21e3e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -204,6 +204,9 @@ RUN curl -fsSL -o oidc_login.tar.gz \
     tar -xf oidc_login.tar.gz -C ${BASE_DIR}/custom_apps && \
     rm oidc_login.tar.gz
 
+# Remove user avatar generation for system addressbook card
+RUN sed -i 's/$this->getAvatarImage($user)/null/' ${BASE_DIR}/apps/dav/lib/CardDAV/Converter.php
+
 # Replace "Get your own free account" NC link with /e/ Account link in public pages
 RUN sed -i 's/https:\/\/nextcloud.com\/signup\//https:\/\/e\.foundation\/<?php p(\$_\[\x27language\x27\]); ?>\/e-email-invite\//' ${BASE_DIR}/core/templates/layout.public.php