diff --git a/docker/Dockerfile b/docker/Dockerfile
index c9cab64..b553998 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -38,7 +38,7 @@ COPY . /build
 # Prepare assets
 RUN yarn install --pure-lockfile --production && \
     yarn cache clean && \
-    sed -i -r -e "s|'cssmin',\s?'cssrewrite'|'rcssmin'|g" /build/powerdnsadmin/assets.py && \
+    sed -i -r -e "s|'rcssmin',\s?'cssrewrite'|'rcssmin'|g" /build/powerdnsadmin/assets.py && \
     flask assets build
 
 RUN mv /build/powerdnsadmin/static /tmp/static && \
diff --git a/powerdnsadmin/assets.py b/powerdnsadmin/assets.py
index 52e8d26..0db26d1 100644
--- a/powerdnsadmin/assets.py
+++ b/powerdnsadmin/assets.py
@@ -38,7 +38,7 @@ css_main = Bundle(
   'node_modules/admin-lte/dist/css/adminlte.css',
   'custom/css/custom.css',
   'node_modules/bootstrap-datepicker/dist/css/bootstrap-datepicker.css',
-  filters=('cssmin', 'cssrewrite'),
+  filters=('rcssmin', 'cssrewrite'),
   output='generated/main.css')
 
 js_main = Bundle(