diff --git a/src/json/token.cr b/src/json/token.cr
index c05b4283797b..8a4ba0c43321 100644
--- a/src/json/token.cr
+++ b/src/json/token.cr
@@ -82,17 +82,17 @@ class JSON::Token
     when .string?
       string_value.to_s(io)
     when .begin_array?
-      io << "["
+      io << '['
     when .end_array?
-      io << "]"
+      io << ']'
     when .begin_object?
-      io << "{"
+      io << '{'
     when .end_object?
-      io << "}"
+      io << '}'
     when .colon?
-      io << ":"
+      io << ':'
     when .comma?
-      io << ","
+      io << ','
     when .eof?
       io << "<EOF>"
     else