diff --git a/install_postfixadmin.sh b/install_postfixadmin.sh
index f92071e..ee239ca 100755
--- a/install_postfixadmin.sh
+++ b/install_postfixadmin.sh
@@ -1859,10 +1859,20 @@ fi
 echo ""
 echononl "\tAdjust Postfix Admin's Configuration - Part 1"
 _failed=false
+if [[ "$POSTFIX_DB_TYPE" = "pgsql" ]]; then
+   _config_db_type="pgsql"
+else
+   # - database_type 'mysql' uses the deprecated mysql extension , and since PHP 7.0 this extension
+   # - is no longer available.
+   # -
+   # - So use 'mysqli' instead of 'mysql'
+   # -
+   _database_type="mysqli"
+fi
 > $log_file
 perl -i -n -p -e "s#^(\s*\\\$CONF\['default_language'\]\s*=.*)#//!\1\n\\\$CONF['default_language'] = 'de';#" \
   $pfa_conf_file >> $log_file 2>&1  || _failed=true 
-perl -i -n -p -e "s#^(\s*\\\$CONF\['database_type'\]\s*=.*)#//!\1\n\\\$CONF['database_type'] = '$POSTFIX_DB_TYPE';#" \
+perl -i -n -p -e "s#^(\s*\\\$CONF\['database_type'\]\s*=.*)#//!\1\n\\\$CONF['database_type'] = '$_database_type';#" \
   $pfa_conf_file >> $log_file 2>&1 || _failed=true 
 perl -i -n -p -e "s#^(\s*\\\$CONF\['database_host'\]\s*=.*)#//!\1\n\\\$CONF['database_host'] = 'localhost';#" \
   $pfa_conf_file >> $log_file 2>&1 || _failed=true