diff --git a/src/plugins/help/CMakeLists.txt b/src/plugins/help/CMakeLists.txt
index 616f53a2bc2..05d2b81152a 100644
--- a/src/plugins/help/CMakeLists.txt
+++ b/src/plugins/help/CMakeLists.txt
@@ -54,6 +54,7 @@ extend_qtc_plugin(Help
   SOURCES
     webenginehelpviewer.cpp
     webenginehelpviewer.h
+  EXPLICIT_MOC webenginehelpviewer.h
 )
 
 extend_qtc_plugin(Help