diff --git a/src/money/currency/json.cr b/src/money/currency/json.cr
index 6325dcd0..986e285f 100644
--- a/src/money/currency/json.cr
+++ b/src/money/currency/json.cr
@@ -19,7 +19,7 @@ class Money::Currency
 
   def self.new(pull : JSON::PullParser)
     case pull.kind
-    when :string
+    when JSON::PullParser::Kind::String
       find(pull.read_string)
     else
       previous_def
diff --git a/src/money/money/json.cr b/src/money/money/json.cr
index ee1b8aea..4227bf89 100644
--- a/src/money/money/json.cr
+++ b/src/money/money/json.cr
@@ -15,7 +15,7 @@ struct Money
 
   def self.new(pull : JSON::PullParser)
     case pull.kind
-    when :string
+    when JSON::PullParser::Kind::String
       parse(pull.read_string)
     else
       previous_def