diff --git a/core/generator.cpp b/core/generator.cpp
index f2862b140..7ab6d170a 100644
--- a/core/generator.cpp
+++ b/core/generator.cpp
@@ -38,6 +38,7 @@ GeneratorPrivate::GeneratorPrivate()
       m_closing( false ), m_closingLoop( nullptr ),
       m_dpi(72.0, 72.0)
 {
+    qRegisterMetaType<Okular::Page*>();
 }
 
 GeneratorPrivate::~GeneratorPrivate()