diff --git a/CMakeLists.txt b/CMakeLists.txt
index a70ba633dc..995d0847f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -417,6 +417,9 @@ if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
 else()
 	message(STATUS "Checking for c-compiler flag: -msse4.2")
 	check_c_compiler_flag(-msse4.2 HAVE_SSE4_2)
+	if(HAVE_SSE4_2)
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.2")
+	endif()
 endif()
 
 check_c_compiler_flag(-fvisibility=hidden FVHIDDEN)