Grok failes due to ÅÄÖ in syslog


So I'm trying to parse our syslog at my company. Most lines work but any line with the Swedish/nordic characters Å Ä Ö failes and the log says

Grok regexp threw exception {:exception=>"incompatible encoding regexp match (UTF-8 regexp with ASCII-8BIT string)"

I've tried to add "encoding: utf-8" on both filebeat and logstash but it still fails.
Any clues?

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