diff --git a/Dockerfile-56 b/Dockerfile-56
index 71240c5..d7c2d0d 100644
--- a/Dockerfile-56
+++ b/Dockerfile-56
@@ -34,8 +34,8 @@ RUN apt-get update && \
 RUN docker-php-ext-install mcrypt
 
 # Install the PHP pdo_mysql extention
-RUN docker-php-ext-install pdo_mysql
-
+RUN docker-php-ext-install mysqli \
+    && docker-php-ext-install pdo_mysql \
 # Install the PHP pdo_pgsql extention
 RUN docker-php-ext-install pdo_pgsql