diff --git a/src/EntityGUI/CMakeLists.txt b/src/EntityGUI/CMakeLists.txt
index a1cfd4736..c42e5095d 100755
--- a/src/EntityGUI/CMakeLists.txt
+++ b/src/EntityGUI/CMakeLists.txt
@@ -25,6 +25,7 @@ INCLUDE(UseQtExt)
 INCLUDE_DIRECTORIES(
   ${PTHREAD_INCLUDE_DIR}
   ${VTK_INCLUDE_DIRS}
+  ${OPENCV_INCLUDE_DIR}
   ${OMNIORB_INCLUDE_DIR}
   ${CAS_INCLUDE_DIRS}
   ${KERNEL_INCLUDE_DIRS}