diff --git a/test/shape/meson.build b/test/shape/meson.build
index 708ae00ba..6262f8b0b 100644
--- a/test/shape/meson.build
+++ b/test/shape/meson.build
@@ -15,7 +15,7 @@ env.set('HAVE_UNISCRIBE', '@0@'.format(conf.get('HAVE_UNISCRIBE', 0)))
 sets = ['in-house', 'aots', 'text-rendering-tests']
 foreach set : sets
   # in-house -> in_house_tests, aots -> aots_tests, text-rendering-tests -> text_rendering_tests
-  varname = '@0@_tests'.format(set.replace('-', '_'))
+  varname = '@0@_tests'.format(set.underscorify())
   varname = varname.replace('tests_tests', 'tests')
   tests = get_variable(varname)
   file_names = []