diff --git a/apache/Dockerfile b/apache/Dockerfile
index 60fd24e3c3..4c2447b91f 100644
--- a/apache/Dockerfile
+++ b/apache/Dockerfile
@@ -1,6 +1,6 @@
 FROM php:5.6-apache
 
-RUN a2enmod rewrite
+RUN a2enmod rewrite expires
 
 # install the PHP extensions we need
 RUN apt-get update && apt-get install -y libpng12-dev libjpeg-dev && rm -rf /var/lib/apt/lists/* \