diff --git a/vcl/null/printerinfomanager.cxx b/vcl/null/printerinfomanager.cxx
index f00dff2e5ee9..a5cd3b438cf2 100644
--- a/vcl/null/printerinfomanager.cxx
+++ b/vcl/null/printerinfomanager.cxx
@@ -21,9 +21,18 @@
 
 #include "unx/gendata.hxx"
 
+// needed since we declare a std::unique_ptr<SystemQueueInfo>
+namespace psp
+{
+    class SystemQueueInfo
+    {
+    };
+}
+
 using namespace psp;
 using namespace osl;
 
+
 PrinterInfoManager& PrinterInfoManager::get()
 {
     SalData* pSalData = GetSalData();