diff --git a/unittests/string_unicode_unicode.chai b/unittests/string_unicode_unicode.chai
index 93092167..2a237ed8 100644
--- a/unittests/string_unicode_unicode.chai
+++ b/unittests/string_unicode_unicode.chai
@@ -1,4 +1,4 @@
-assert_equal('\uc39c', 'Ü')
+assert_equal("\uc39c", "Ü")
 assert_equal("U for \uc39cmlauts", "U for Ümlauts")
 assert_equal("More \uc39cml\uc3a4\uc3bcts", "More Ümläüts")