diff --git a/CMakeLists.txt b/CMakeLists.txt
index c66feca..6d33b1e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -473,7 +473,8 @@
   # At least on Linux, we need pthreads to be enabled for mutex to compile.
   # This may not work on windows or android.
   FIND_PACKAGE(Threads REQUIRED)
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
+  SET(STATIC_LIBRARY_FLAGS "${STATIC_LIBRARY_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
+  SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
   ADD_DEFINITIONS(-DCERES_HAVE_PTHREAD)
   ADD_DEFINITIONS(-DCERES_HAVE_RWLOCK)
 ENDIF ("${UNIX}" AND NOT ${BUILD_ANDROID})