diff --git a/openbr/plugins/cmake/libav.cmake b/openbr/plugins/cmake/libav.cmake
index d2ddd4c..c5cd622 100644
--- a/openbr/plugins/cmake/libav.cmake
+++ b/openbr/plugins/cmake/libav.cmake
@@ -4,9 +4,10 @@ if(${BR_WITH_LIBAV})
   find_package(LibAV REQUIRED)
   include_directories(${LIBAV_INCLUDE_DIR})
   set(BR_THIRDPARTY_LIBS ${BR_THIRDPARTY_LIBS} ${LIBAV_LIBRARIES})
-  set(BR_THIRDPARTY_SRC ${BR_THIRDPARTY_SRC} plugins/gallery/keyframes.cpp)
   
   foreach(LIBAV_LIB ${LIBAV_LIBRARIES})
     install(FILES ${LIBAV_LIB} DESTINATION lib)
   endforeach()
+else()
+  set(BR_EXCLUDED_PLUGINS ${BR_EXCLUDED_PLUGINS} plugins/gallery/keyframes.cpp)
 endif()