diff --git a/vtu_to_vti_converter/source/main.cpp b/vtu_to_vti_converter/source/main.cpp
index 15b39a142e3010ab611c528265366961472cb673..fc7f906bda0e647fa0e7f13cb27406f5b8359d5e 100644
--- a/vtu_to_vti_converter/source/main.cpp
+++ b/vtu_to_vti_converter/source/main.cpp
@@ -1,8 +1,10 @@
 #include <cstdint>
 #include <string>
 
-#include <vtkXMLImageDataWriter.h>
+#include <vtkDataObject.h>
 #include <vtkResampleToImage.h>
+#include <vtkSmartPointer.h>
+#include <vtkXMLImageDataWriter.h>
 #include <vtkXMLUnstructuredGridReader.h>
 
 // Usage: ./vtu_to_vti_converter [VTU_FILEPATH] [X_RESOLUTION] [Y_RESOLUTION] [Z_RESOLUTION].