diff --git a/cmake_modules/SwiftenConfig.cmake b/cmake_modules/SwiftenConfig.cmake
index 9833462e0da4845713dfa1612f3c4df5ed38a0f0..9b0436d98956f5d8ccea2be6fd6b39a0c0181791 100644
--- a/cmake_modules/SwiftenConfig.cmake
+++ b/cmake_modules/SwiftenConfig.cmake
@@ -44,6 +44,9 @@ if( SWIFTEN_LIBRARY AND SWIFTEN_INCLUDE_DIR )
 			message( STATUS "Found Swiften > 4 requesting C++11")
 			set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
 		endif()
+		if("${SWIFTEN_VERSION}" STRLESS "4")
+			set(CMAKE_CXX_FLAGS "-DBOOST_SIGNALS_NO_DEPRECATION_WARNING ${CMAKE_CXX_FLAGS}")
+		endif()
 		
 		set( SWIFTEN_FOUND 1 )
 	else()