diff --git a/oracle/CMakeLists.txt b/oracle/CMakeLists.txt
index 340ce16a..8e1f9b16 100644
--- a/oracle/CMakeLists.txt
+++ b/oracle/CMakeLists.txt
@@ -13,6 +13,7 @@ SET(oracle_SOURCES
     src/window_main.cpp
     ../cockatrice/src/carddatabase.cpp
     ../cockatrice/src/settingscache.cpp
+    ../cockatrice/src/qt-json/json.cpp
  )
 
 SET(QT_USE_QTNETWORK TRUE)