diff --git a/src/meshlabplugins/filter_plymc/volume.h b/src/meshlabplugins/filter_plymc/volume.h
index 8d6bf7775..ea7fc6c09 100644
--- a/src/meshlabplugins/filter_plymc/volume.h
+++ b/src/meshlabplugins/filter_plymc/volume.h
@@ -24,8 +24,8 @@
 #define _int64 __int64
 #endif
 
-#include "Voxel.h"
-#include "SVoxel.h"
+#include "voxel.h"
+#include "svoxel.h"
 #include <vector>
 #include <vcg/space/index/grid_static_ptr.h>