diff --git a/src/plugins/help/searchtaskhandler.h b/src/plugins/help/searchtaskhandler.h
index dbc2b653b74..683f0718fde 100644
--- a/src/plugins/help/searchtaskhandler.h
+++ b/src/plugins/help/searchtaskhandler.h
@@ -32,6 +32,8 @@
 
 #include <projectexplorer/itaskhandler.h>
 
+QT_FORWARD_DECLARE_CLASS(QUrl)
+
 namespace Help {
 namespace Internal {