diff --git a/debian/additions/mariadb.conf.d/50-server.cnf b/debian/additions/mariadb.conf.d/50-server.cnf
index ee30148fc8e81c45a201eab6da2be52854fa6ee7..0365b364b7b7c562762d3db1269a39385599b512 100644
--- a/debian/additions/mariadb.conf.d/50-server.cnf
+++ b/debian/additions/mariadb.conf.d/50-server.cnf
@@ -78,12 +78,6 @@ max_binlog_size   = 100M
 #binlog_do_db		= include_database_name
 #binlog_ignore_db	= exclude_database_name
 
-#
-# * InnoDB
-#
-# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
-# Read the manual for more InnoDB related options. There are many!
-
 #
 # * Security Features
 #
@@ -111,6 +105,18 @@ max_binlog_size   = 100M
 character-set-server  = utf8mb4
 collation-server      = utf8mb4_general_ci
 
+#
+# * InnoDB
+#
+# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
+# Read the manual for more InnoDB related options. There are many!
+#
+# Allow index key prefixes up to 3072 bytes. If not set, the limit is 767 bytes.
+# This is important as utf8mb4 is used. See Debian bug #886756.
+innodb_file_format        = barracuda
+innodb_large_prefix       = on
+innodb_default_row_format = dynamic
+
 #
 # * Unix socket authentication plugin is built-in since 10.0.22-6
 #