diff --git a/include/assimp/Exporter.hpp b/include/assimp/Exporter.hpp
index 6fcbafe92..15918dd47 100644
--- a/include/assimp/Exporter.hpp
+++ b/include/assimp/Exporter.hpp
@@ -110,9 +110,9 @@ public:
         ExportFormatEntry() :
                 mExportFunction(),
                 mEnforcePP() {
-            mDescription.id = NULL;
-            mDescription.description = NULL;
-            mDescription.fileExtension = NULL;
+            mDescription.id = nullptr;
+            mDescription.description = nullptr;
+            mDescription.fileExtension = nullptr;
         }
     };