diff --git a/roundcube/Dockerfile b/roundcube/Dockerfile
index 222ddc22..546f5d8e 100644
--- a/roundcube/Dockerfile
+++ b/roundcube/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:apache
+FROM php:5-apache
 
 RUN apt-get update && apt-get install -y \
       libfreetype6-dev \