diff --git a/apps/sample/trimesh_join/trimesh_join.cpp b/apps/sample/trimesh_join/trimesh_join.cpp
index cc1331b5..02f31bd8 100644
--- a/apps/sample/trimesh_join/trimesh_join.cpp
+++ b/apps/sample/trimesh_join/trimesh_join.cpp
@@ -5,6 +5,7 @@
 #include<vcg/simplex/face/topology.h>
 
 #include<vcg/complex/trimesh/base.h>
+#include<vcg/complex/trimesh/allocate.h>
 #include<vcg/complex/trimesh/append.h>
 #include<vcg/complex/trimesh/clean.h>
 #include<vcg/complex/trimesh/update/bounding.h>