diff --git a/CMakeLists.txt b/CMakeLists.txt
index 17379f3..e00acd4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,5 @@
+include(CheckCXXCompilerFlag)
+
 set(SRCS
 	src/AAFilter.cpp
 	src/BPMDetect.cpp
@@ -14,5 +16,18 @@ set(SRCS
 	src/sse_optimized.cpp
 	src/TDStretch.cpp)
 
+if(NOT MSVC)
+	check_cxx_compiler_flag(-mmmx SOUNDTOUCH_HAS_MMMX)
+	check_cxx_compiler_flag(-msse SOUNDTOUCH_HAS_MSSE)
+	if(SOUNDTOUCH_HAS_MMMX)
+		set_source_files_properties(src/mmx_optimized.cpp
+					    PROPERTIES COMPILE_FLAGS "-mmmx")
+	endif()
+	if(SOUNDTOUCH_HAS_MSSE)
+		set_source_files_properties(src/sse_optimized.cpp
+					    PROPERTIES COMPILE_FLAGS "-msse")
+	endif()
+endif()
+
 add_library(SoundTouch STATIC ${SRCS})
 target_include_directories(SoundTouch PUBLIC include PRIVATE src)