diff --git a/wrap/io_trimesh/export_vmi.h b/wrap/io_trimesh/export_vmi.h
index aa6641a7..02e63651 100644
--- a/wrap/io_trimesh/export_vmi.h
+++ b/wrap/io_trimesh/export_vmi.h
@@ -271,15 +271,15 @@ namespace io {
 			/* end header */
 
 			if(vertSize!=0){
-                                size_t offsetV = (size_t) &m.vert[0];
+                                void * offsetV =  (void*) &m.vert[0];
 				/* write the address of the first vertex */
-                                fwrite(&offsetV,sizeof(size_t),1,F());
+                                fwrite(&offsetV,sizeof(void *),1,F());
 			}
 
 			if(faceSize!=0){
-                                 size_t offsetF= ( size_t) &m.face[0];
+                                 void * offsetF= (void*)&m.face[0];
 				/* write the address of the first face */
-                                fwrite(&offsetF,sizeof( size_t),1,F());
+                                fwrite(&offsetF,sizeof( void *),1,F());
 			}
 			/* save the object mesh */
 			fwrite(&m.shot,sizeof(Shot<typename SaveMeshType::ScalarType>),1,F());
diff --git a/wrap/io_trimesh/import_vmi.h b/wrap/io_trimesh/import_vmi.h
index a1618def..efdd4366 100644
--- a/wrap/io_trimesh/import_vmi.h
+++ b/wrap/io_trimesh/import_vmi.h
@@ -652,15 +652,15 @@ namespace io {
             if(fnameV != nameV) return VMI_INCOMPATIBLE_VERTEX_TYPE;
             if(fnameF != nameF) return VMI_INCOMPATIBLE_FACE_TYPE;
 
-			 int offsetV=0,offsetF=0;
+			 void *  offsetV = 0,*offsetF = 0;
 
 			 if(vertSize!=0)
 				/* read the address of the first vertex */
-				fread(&offsetV,sizeof( int),1,F());
+				fread(&offsetV,sizeof( void *),1,F());
 
 			 if(faceSize!=0)
 				/* read the address of the first face */
-				fread(&offsetF,sizeof( int),1,F());
+				fread(&offsetF,sizeof( void *),1,F());
 
 			/* read the object mesh */
 			fread(&m.shot,sizeof(Shot<typename OpenMeshType::ScalarType>),1,F());