diff --git a/src/crafana/models/alias_colors.cr b/src/crafana/models/alias_colors.cr
deleted file mode 100644
index ede2441..0000000
--- a/src/crafana/models/alias_colors.cr
+++ /dev/null
@@ -1,14 +0,0 @@
-require "json"
-
-module Crafana
-  class AliasColors
-    include JSON::Serializable
-
-    property green : String
-    property red : String
-    property yellow : String
-
-    def initialize(@green, @red, @yellow)
-    end
-  end
-end
diff --git a/src/crafana/models/panels/graph.cr b/src/crafana/models/panels/graph.cr
index a65a29b..ce7103d 100644
--- a/src/crafana/models/panels/graph.cr
+++ b/src/crafana/models/panels/graph.cr
@@ -11,7 +11,7 @@ module Crafana
     include TargetList
 
     @[JSON::Field(key: "aliasColors")]
-    property alias_colors : AliasColors? = nil
+    property alias_colors : Hash(String, String)?
 
     property bars : Bool = false