diff --git a/libs/imageproperties/markerclusterholderplugin/CMakeLists.txt b/libs/imageproperties/markerclusterholderplugin/CMakeLists.txt
index 9ee36cc..c6e5c00 100644
--- a/libs/imageproperties/markerclusterholderplugin/CMakeLists.txt
+++ b/libs/imageproperties/markerclusterholderplugin/CMakeLists.txt
@@ -18,6 +18,7 @@ IF(MARBLEWIDGET_SUPPORTS_PLUGINS)
 
     INCLUDE_DIRECTORIES( ${CMAKE_CURRENT_SOURCE_DIR}/libs/imageproperties/markerclusterholderplugin/
                          ${CMAKE_BINARY_DIR}/libs/imageproperties/markerclusterholderplugin/
+						 ${LIBMARBLEWIDGET_INCLUDE_DIR}/..
                          ${QT_INCLUDE_DIR}
                        )