diff --git a/code/Exporter.cpp b/code/Exporter.cpp
index 0acde75bf..0414f661c 100644
--- a/code/Exporter.cpp
+++ b/code/Exporter.cpp
@@ -288,7 +288,7 @@ void Exporter::SetProgressHandler(ProgressHandler* pHandler) {
 
 // ------------------------------------------------------------------------------------------------
 const aiExportDataBlob* Exporter::ExportToBlob( const aiScene* pScene, const char* pFormatId,
-                                                unsigned int, const ExportProperties* /*pProperties*/ ) {
+                                                unsigned int pPreprocessing, const ExportProperties* pProperties) {
     if (pimpl->blob) {
         delete pimpl->blob;
         pimpl->blob = nullptr;
@@ -298,7 +298,7 @@ const aiExportDataBlob* Exporter::ExportToBlob( const aiScene* pScene, const cha
     BlobIOSystem* blobio = new BlobIOSystem();
     pimpl->mIOSystem = std::shared_ptr<IOSystem>( blobio );
 
-    if (AI_SUCCESS != Export(pScene,pFormatId,blobio->GetMagicFileName())) {
+    if (AI_SUCCESS != Export(pScene,pFormatId,blobio->GetMagicFileName(), pPreprocessing, pProperties)) {
         pimpl->mIOSystem = old;
         return nullptr;
     }
diff --git a/include/assimp/Exporter.hpp b/include/assimp/Exporter.hpp
index 4e0843b60..d254aae66 100644
--- a/include/assimp/Exporter.hpp
+++ b/include/assimp/Exporter.hpp
@@ -190,7 +190,7 @@ public:
     * @note Use aiCopyScene() to get a modifiable copy of a previously
     *   imported scene. */
     const aiExportDataBlob* ExportToBlob(const aiScene* pScene, const char* pFormatId,
-        unsigned int pPreprocessing = 0u, const ExportProperties* = nullptr);
+        unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);
     const aiExportDataBlob* ExportToBlob(  const aiScene* pScene, const std::string& pFormatId,
         unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);