diff --git a/apps/sample/trimesh_QT/trimesh_qt.pro b/apps/sample/trimesh_QT/trimesh_qt.pro
index 8a3c7fc6..fd1e6692 100644
--- a/apps/sample/trimesh_QT/trimesh_qt.pro
+++ b/apps/sample/trimesh_QT/trimesh_qt.pro
@@ -17,6 +17,7 @@ OBJECTS_DIR = build/obj
 # Lib headers
 INCLUDEPATH += .
 INCLUDEPATH += ../../..
+INCLUDEPATH += ../../../eigenlib
 
 # Lib sources
 SOURCES += ../../../wrap/ply/plylib.cpp