diff --git a/src/swayfocus.cr b/src/swayfocus.cr
index 35a19c7..ddb6733 100644
--- a/src/swayfocus.cr
+++ b/src/swayfocus.cr
@@ -22,7 +22,7 @@ class Window
 
     property app_id : String = ""
 
-    @[JSON::Field(key: "class")]
+    @[JSON::Field(key: "window_properties", root: "class")]
     property wclass : String = ""
 
     property marks : Array(String) = [] of String
@@ -90,7 +90,10 @@ OptionParser.parse do |parser|
     end
 
     parser.on "-t WTYPE", "--type=WTYPE", "Match against window type (app_id for wayland, class for xwayland)" do |wtype|
-    	window_list.select! {|w| w.app_id.includes?(wtype) || w.wclass.includes?(wtype)}
+    	window_list.select! {|w| puts w.name
+    	puts w.app_id
+    	puts w.wclass
+    	w.app_id.includes?(wtype) || w.wclass.includes?(wtype)}
     end
   
     parser.invalid_option do |flag|