diff --git a/runner/master/mysql.d/master/conf.d/master.cnf b/runner/master/mysql.d/master/conf.d/master.cnf
index 1c8258c..b5d2911 100644
--- a/runner/master/mysql.d/master/conf.d/master.cnf
+++ b/runner/master/mysql.d/master/conf.d/master.cnf
@@ -2,9 +2,7 @@
 default-character-set = utf8mb4
 
 [mysqld]
-innodb_file_format = Barracuda
 innodb_file_per_table = 1
-innodb_large_prefix = On
 
 character-set-server = utf8mb4
 collation-server = utf8mb4_bin
diff --git a/runner/master/mysql.d/slave/config/moodle.cnf b/runner/master/mysql.d/slave/config/moodle.cnf
index 2f79523..f1fff2e 100644
--- a/runner/master/mysql.d/slave/config/moodle.cnf
+++ b/runner/master/mysql.d/slave/config/moodle.cnf
@@ -2,9 +2,7 @@
 default-character-set = utf8mb4
 
 [mysqld]
-innodb_file_format = Barracuda
 innodb_file_per_table = 1
-innodb_large_prefix = On
 
 character-set-server = utf8mb4
 collation-server = utf8mb4_bin
diff --git a/runner/master/mysql.d/standalone/conf.d/moodle.cnf b/runner/master/mysql.d/standalone/conf.d/moodle.cnf
index 374c42b..e7c9811 100644
--- a/runner/master/mysql.d/standalone/conf.d/moodle.cnf
+++ b/runner/master/mysql.d/standalone/conf.d/moodle.cnf
@@ -2,9 +2,7 @@
 default-character-set = utf8mb4
 
 [mysqld]
-innodb_file_format = Barracuda
 innodb_file_per_table = 1
-innodb_large_prefix = On
 
 character-set-server = utf8mb4
 collation-server = utf8mb4_bin
diff --git a/runner/master/run.sh b/runner/master/run.sh
index cfcf6a4..e984567 100755
--- a/runner/master/run.sh
+++ b/runner/master/run.sh
@@ -324,7 +324,7 @@ then
       --tmpfs /var/lib/mysql:rw \
       -v $SCRIPTPATH/mysql.d/master/conf.d:/etc/mysql/conf.d \
       -v $SCRIPTPATH/mysql.d/master/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d \
-      mariadb:10.2
+      mariadb
 
     echo "Starting slave"
     docker run \
@@ -340,7 +340,7 @@ then
       -v $SCRIPTPATH/mysql.d/slave/config:/config \
       -v $SCRIPTPATH/mysql.d/slave/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d \
       --tmpfs /var/lib/mysql:rw \
-      mariadb:10.2
+      mariadb
 
     # Hack to make gosu work for all users on the slave.
     docker exec -u root $DBHOST_SLAVE bash -c 'chown root:mysql /usr/local/bin/gosu'
@@ -357,7 +357,7 @@ then
       -e MYSQL_PASSWORD="${DBPASS}" \
       --tmpfs /var/lib/mysql:rw \
       -v $SCRIPTPATH/mysql.d/standalone/conf.d:/etc/mysql/conf.d \
-      mariadb:10.2
+      mariadb
   fi
 
   export DBCOLLATION=utf8mb4_bin