diff --git a/CMakeLists.txt b/CMakeLists.txt
index 53a5e79..7bd8a15 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -123,6 +123,7 @@ if(SOUNDTOUCH_DLL)
   set_target_properties(SoundTouch PROPERTIES POSITION_INDEPENDENT_CODE TRUE)
   target_compile_options(SoundTouchDLL PRIVATE ${COMPILE_OPTIONS})
   set_target_properties(SoundTouchDLL PROPERTIES CXX_VISIBILITY_PRESET hidden)
+  target_compile_definitions(SoundTouchDLL PRIVATE DLL_EXPORTS)
   target_include_directories(SoundTouchDLL PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>)
   target_link_libraries(SoundTouchDLL PRIVATE SoundTouch)
   install(FILES source/SoundTouchDLL/SoundTouchDLL.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/soundtouch")