diff --git a/rtengine/CMakeLists.txt b/rtengine/CMakeLists.txt
index 638b21613..688c7455e 100644
--- a/rtengine/CMakeLists.txt
+++ b/rtengine/CMakeLists.txt
@@ -2,7 +2,7 @@
 include_directories (${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/../rtexif
     ${EXTRA_INCDIR} ${GTHREAD_INCLUDE_DIRS} ${GOBJECT_INCLUDE_DIRS} ${GLIB2_INCLUDE_DIRS}
     ${GLIBMM_INCLUDE_DIRS} ${IPTCDATA_INCLUDE_DIRS} ${LCMS_INCLUDE_DIRS}
-	${CMAKE_CURRENT_SOURCE_DIR}/../rtgui ${GTKMM_INCLUDE_DIRS})
+	${CMAKE_CURRENT_SOURCE_DIR}/../rtgui ${GTKMM_INCLUDE_DIRS} ${GTK_INCLUDE_DIRS})
 link_directories (${CMAKE_CURRENT_SOURCE_DIR}/../rtexif ${EXTRA_LIBDIR} ${GTHREAD_LIBRARY_DIRS}
     ${GOBJECT_LIBRARY_DIRS} ${GLIB2_LIBRARY_DIRS} ${GLIBMM_LIBRARY_DIRS}
     ${IPTCDATA_LIBRARY_DIRS} ${LCMS_LIBRARY_DIRS})