diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e355c1..b5399d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -286,7 +286,7 @@ add_definitions(
   -DHAVE_CONFIG_H
 )
 
-set( CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined" )
+set( CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined" )
 
 
 ##### project subdirectories ####################