diff --git a/tests/reference/novelwriter.conf b/tests/reference/novelwriter.conf
index acc95a94..5f4768e6 100644
--- a/tests/reference/novelwriter.conf
+++ b/tests/reference/novelwriter.conf
@@ -4,6 +4,7 @@ theme = default
 syntax = default_light
 icons = typicons_grey_light
 guidark = False
+guifontsize = 12
 
 [Sizes]
 geometry = 1100, 650