diff --git a/tests/TestSurfaceExtractor.cpp b/tests/TestSurfaceExtractor.cpp
index 95ebb299..496c39ac 100644
--- a/tests/TestSurfaceExtractor.cpp
+++ b/tests/TestSurfaceExtractor.cpp
@@ -25,6 +25,7 @@ freely, subject to the following restrictions:
 
 #include "PolyVoxCore/Density.h"
 #include "PolyVoxCore/MaterialDensityPair.h"
+#include "PolyVoxCore/RawVolume.h"
 #include "PolyVoxCore/SimpleVolume.h"
 #include "PolyVoxCore/MarchingCubesSurfaceExtractor.h"