diff --git a/generators/plucker/generator_plucker.cpp b/generators/plucker/generator_plucker.cpp
index 038996099..d98ae0d17 100644
--- a/generators/plucker/generator_plucker.cpp
+++ b/generators/plucker/generator_plucker.cpp
@@ -120,6 +120,9 @@ bool PluckerGenerator::doCloseDocument()
     qDeleteAll( mPages );
     mPages.clear();
 
+    // do not use clear() for the following, otherwise its type is changed
+    mDocumentInfo = Okular::DocumentInfo();
+
     return true;
 }