diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index 0b3d046fe1..36e8781fd4 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -376,6 +376,7 @@ if (BUILD_LAGOM)
 
         # WebView
         list(APPEND LIBWEBVIEW_SOURCES "../../Userland/Libraries/LibWebView/DOMTreeModel.cpp")
+        list(APPEND LIBWEBVIEW_SOURCES "../../Userland/Libraries/LibWebView/StylePropertiesModel.cpp")
         list(APPEND LIBWEBVIEW_SOURCES "../../Userland/Libraries/LibWebView/WebContentClient.cpp")
 
         compile_ipc(${SERENITY_PROJECT_ROOT}/Userland/Services/WebContent/WebContentServer.ipc WebContent/WebContentServerEndpoint.h)