diff --git a/openbr/plugins/dlib.cmake b/openbr/plugins/dlib.cmake
index 958af62..9c594ad 100644
--- a/openbr/plugins/dlib.cmake
+++ b/openbr/plugins/dlib.cmake
@@ -3,6 +3,8 @@ set(BR_WITH_DLIB OFF CACHE BOOL "Build with DLib")
 if(${BR_WITH_DLIB})
   find_package(DLib REQUIRED)
 
+  add_definitions(-DDLIB_NO_GUI_SUPPORT)
+
   set(BR_THIRDPARTY_SRC ${BR_THIRDPARTY_SRC} plugins/dlib.cpp)
   set(BR_THIRDPARTY_SRC ${BR_THIRDPARTY_SRC} ${DLib_DIR}/dlib/all/source.cpp)