diff --git a/spec/srb_json_load_spec.rb b/spec/srb_json_load_spec.rb
index 8c9da6f9..dbbea7e4 100644
--- a/spec/srb_json_load_spec.rb
+++ b/spec/srb_json_load_spec.rb
@@ -5,7 +5,8 @@
   './lib/engines/hckinstall/kits/*.json' => AutoHCK::Models::Kit,
   './lib/engines/hcktest/hcktest.json' => AutoHCK::Models::HCKTestConfig,
   './svvp.json' => AutoHCK::Models::SVVPConfig,
-  './lib/setupmanagers/qemuhck/devices/*.json' => AutoHCK::Models::QemuHCKDevice
+  './lib/setupmanagers/qemuhck/devices/*.json' => AutoHCK::Models::QemuHCKDevice,
+  './lib/engines/hcktest/extensions/*.json' => AutoHCK::Models::Extension
 }.freeze
 
 describe 'srb_json_load' do