diff --git a/src/frontend/gtk2/CMakeLists.txt b/src/frontend/gtk2/CMakeLists.txt
index c8d3cee..06fa7d6 100644
--- a/src/frontend/gtk2/CMakeLists.txt
+++ b/src/frontend/gtk2/CMakeLists.txt
@@ -20,6 +20,8 @@ endif()
 
 include_directories(${GTK2_INCLUDE_DIRS})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
+include_directories(${DBUS_INCLUDE_DIRS})
+
 link_directories(${GTK2_LIBRARY_DIRS})
 
 include_directories(${GIO2_INCLUDE_DIRS})
diff --git a/src/frontend/gtk3/CMakeLists.txt b/src/frontend/gtk3/CMakeLists.txt
index 06a77b1..0d9e278 100644
--- a/src/frontend/gtk3/CMakeLists.txt
+++ b/src/frontend/gtk3/CMakeLists.txt
@@ -15,6 +15,7 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 link_directories(${GTK3_LIBRARY_DIRS})
 
 include_directories(${GIO2_INCLUDE_DIRS})
+include_directories(${DBUS_INCLUDE_DIRS})
 link_directories(${GIO2_LIBRARY_DIRS})
 
 set(FCITX_GTK3_IM_MODULE_SOURCES