diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 0d5a8374d..d884faa4c 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -160,7 +160,7 @@ if( BUILD_KDM OR BUILD_KSMSERVER )
 
   # check for dbus-tqt
   tde_save( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
-  set( CMAKE_REQUIRED_INCLUDES ${QT_INCLUDE_DIRS} ${DBUS_INCLUDE_DIRS} )
+  set( CMAKE_REQUIRED_INCLUDES ${QT_INCLUDE_DIRS} ${TQT_INCLUDE_DIRS} ${DBUS_INCLUDE_DIRS} )
   set( CMAKE_REQUIRED_LIBRARIES ${TQT_LDFLAGS} )
   check_cxx_source_compiles("
     #include <tqt.h>