diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e4060a..44206eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -216,6 +216,7 @@ if(BUILD_SHARED_LIBS)
 
   # Set compile-time definitions
   target_compile_definitions(rtaudio PRIVATE ${API_DEFS})
+  target_compile_definitions(rtaudio PRIVATE RTAUDIO_EXPORT)
 
   target_link_libraries(rtaudio ${LINKLIBS})
 endif()